diff --git a/examples/README.md b/examples/README.md
index d36bf4325..83294681a 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -176,16 +176,16 @@ For **001-SimpleWeb**, `bin/compile.php` is timed **without** compile-time `-q`;
 
 For **003-MiniWebApp**, VM/JIT/native columns run `public/index.php` with `PATH_INFO=/home` (and related CGI env) from the example `public/` directory ([#491](https://github.com/PurHur/php-compiler/issues/491), runtime [#539](https://github.com/PurHur/php-compiler/issues/539)). AOT columns time `phpc build --project` and `.phpc/bin/app` with the same CGI overlay when LLVM is ready and execute returns HTML ([#716](https://github.com/PurHur/php-compiler/issues/716); execute [#764](https://github.com/PurHur/php-compiler/issues/764) closed). The row is omitted when `phpc lint --all examples/003-MiniWebApp` fails unless `BENCH_MINIWEBAPP=1`.
 
-For **005-SessionsWeb**, the benchmark row is omitted until `phpc lint --all examples/005-SessionsWeb` passes unless `BENCH_SESSIONSWEB=1` ([#1889](https://github.com/PurHur/php-compiler/issues/1889)). AOT columns stay `n/a` until two-request session execute is green ([#1891](https://github.com/PurHur/php-compiler/issues/1891)).
+For **005-SessionsWeb**, the benchmark row is omitted until `phpc lint --all examples/005-SessionsWeb` passes unless `BENCH_SESSIONSWEB=1` ([#1889](https://github.com/PurHur/php-compiler/issues/1889)). AOT columns time `phpc build --project` and a two-request session flash on `.phpc/bin/app` when LLVM is ready ([#1891](https://github.com/PurHur/php-compiler/issues/1891), [#1973](https://github.com/PurHur/php-compiler/issues/1973)); use `BENCH_SESSIONSWEB_AOT=1 ./script/rebuild-examples.php` to force AOT columns on harness regen.
 
 <!-- benchmark table start -->
 
 |         Example Name |      Native PHP |      bin/vm.php |     bin/jit.php | bin/compile.php |      ./compiled |
 |----------------------|-----------------|-----------------|-----------------|-----------------|-----------------|
-|       000-HelloWorld |         0.00760 |         0.04387 |         0.17749 |         1.33163 |         0.00109 |
-|        001-SimpleWeb |         0.00764 |         0.04682 |         0.18321 |         1.34592 |         0.00109 |
-|        002-StaticWeb |         0.00770 |         0.04771 |         0.17846 |         1.35182 |         0.00111 |
-|       003-MiniWebApp |         0.00838 |         0.08591 |         0.45166 |         1.75921 |         0.00098 |
-|          004-ApiJson |         0.00837 |         0.04503 |         0.17964 |         1.36437 |         0.00128 |
-|      005-SessionsWeb |         0.00855 |         0.04840 |         0.19095 |             n/a |             n/a |
+|       000-HelloWorld |         0.00792 |         0.04623 |         0.20762 |         1.87538 |         0.00156 |
+|        001-SimpleWeb |         0.00895 |         0.04740 |         0.18640 |         1.35069 |         0.00118 |
+|        002-StaticWeb |         0.00980 |         0.05066 |         0.18906 |         1.36219 |         0.00123 |
+|       003-MiniWebApp |         0.00771 |         0.09690 |         0.52931 |         1.83640 |         0.00106 |
+|          004-ApiJson |         0.00850 |         0.04705 |         0.19092 |         2.98758 |         0.00116 |
+|      005-SessionsWeb |         0.01742 |         0.05082 |         0.19587 |         1.43149 |         0.00277 |
 <!-- benchmark table end -->
diff --git a/script/check-rebuild-examples-005-row.php b/script/check-rebuild-examples-005-row.php
index c25a64455..2559611f7 100755
--- a/script/check-rebuild-examples-005-row.php
+++ b/script/check-rebuild-examples-005-row.php
@@ -9,11 +9,15 @@
  * Benchmark row policy matches script/rebuild-examples.php (issue #1889):
  *   - Include when BENCH_SESSIONSWEB=1 or phpc lint --all examples/005-SessionsWeb passes
  *   - Omit when lint fails unless BENCH_SESSIONSWEB=1
+ *   - AOT columns: n/a when LLVM/execute probe fails; real timings when probe passes (#1891, #1973)
  *
  * Usage:
  *   php script/check-rebuild-examples-005-row.php
  */
 
+require_once __DIR__.'/../test/support/CgiCookieJar.php';
+require_once __DIR__.'/../test/support/SessionsWebCgiEnv.php';
+
 $root = dirname(__DIR__);
 $readme = $root.'/examples/README.md';
 $exampleDir = $root.'/examples/005-SessionsWeb';
@@ -49,8 +53,8 @@
 
 if ($hasRow) {
     $rowLine = extract_sessions_web_benchmark_line($body);
-    if (null !== $rowLine && !benchmark_row_aot_columns_honest($rowLine)) {
-        $errors[] = 'examples/README.md: 005-SessionsWeb benchmark row must keep bin/compile.php and ./compiled as n/a until AOT execute is green (#1891)';
+    if (null !== $rowLine && !benchmark_row_aot_columns_honest($rowLine, $root)) {
+        $errors[] = 'examples/README.md: 005-SessionsWeb benchmark AOT columns out of sync (run: BENCH_SESSIONSWEB=1 BENCH_SESSIONSWEB_AOT=1 ./script/rebuild-examples.php; #1973)';
     }
 }
 
@@ -127,12 +131,8 @@ function extract_sessions_web_benchmark_line(string $readmeBody): ?string
     return trim($line[0]);
 }
 
-function benchmark_row_aot_columns_honest(string $rowLine): bool
+function benchmark_row_aot_columns_honest(string $rowLine, string $repoRoot): bool
 {
-    if ('1' === getenv('BENCH_SESSIONSWEB_AOT')) {
-        return true;
-    }
-
     $parts = array_map('trim', explode('|', $rowLine));
     $parts = array_values(array_filter($parts, static fn (string $p): bool => '' !== $p));
     if (count($parts) < 6) {
@@ -140,6 +140,186 @@ function benchmark_row_aot_columns_honest(string $rowLine): bool
     }
     $compileCol = $parts[4] ?? '';
     $compiledCol = $parts[5] ?? '';
+    $compileNa = (bool) preg_match('/n\/a/i', $compileCol);
+    $compiledNa = (bool) preg_match('/n\/a/i', $compiledCol);
+
+    if (!llvm_ready_for_check($repoRoot)) {
+        return true;
+    }
+
+    if ('1' === getenv('BENCH_SESSIONSWEB_AOT')) {
+        return !$compileNa && !$compiledNa;
+    }
+
+    if (sessions_web_aot_execute_probe($repoRoot)) {
+        return !$compileNa && !$compiledNa;
+    }
+
+    return $compileNa && $compiledNa;
+}
+
+function llvm_ready_for_check(string $repoRoot): bool
+{
+    $candidates = [];
+    $fromEnv = getenv('PHP_COMPILER_LLVM_PATH');
+    if (false !== $fromEnv && '' !== $fromEnv) {
+        $candidates[] = $fromEnv;
+    }
+    $candidates[] = $repoRoot.'/.llvm';
+    $candidates[] = '/opt/llvm9';
+    foreach ($candidates as $dir) {
+        if (is_file($dir.'/libLLVM-9.so.1')) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+function sessions_web_aot_execute_probe(string $repoRoot): bool
+{
+    if ('0' === getenv('SESSIONS_WEB_AOT_PROBE')) {
+        return false;
+    }
+    if (!llvm_ready_for_check($repoRoot)) {
+        return false;
+    }
+    $phpc = $repoRoot.'/phpc';
+    $project = $repoRoot.'/examples/005-SessionsWeb';
+    $binary = $project.'/.phpc/bin/app';
+    if (!is_executable($phpc) || !is_file($project.'/example.php')) {
+        return false;
+    }
+
+    $sessionDir = sys_get_temp_dir().'/phpc_check_sessionsweb_'.uniqid('', true);
+    if (!@mkdir($sessionDir, 0700, true) && !is_dir($sessionDir)) {
+        return false;
+    }
+
+    $env = [];
+    foreach ($_ENV as $key => $value) {
+        if (is_string($value)) {
+            $env[$key] = $value;
+        }
+    }
+    $llvmDir = null;
+    foreach ([getenv('PHP_COMPILER_LLVM_PATH') ?: '', $repoRoot.'/.llvm', '/opt/llvm9'] as $dir) {
+        if ('' !== $dir && is_file($dir.'/libLLVM-9.so.1')) {
+            $llvmDir = realpath($dir) ?: $dir;
+            break;
+        }
+    }
+    if (null !== $llvmDir) {
+        $env['PHP_COMPILER_LLVM_PATH'] = $llvmDir;
+        $ld = $env['LD_LIBRARY_PATH'] ?? '';
+        $env['LD_LIBRARY_PATH'] = '' === $ld ? $llvmDir : $llvmDir.':'.$ld;
+    }
+    $env['PHP_COMPILER_SESSION_DIR'] = $sessionDir;
+
+    if (!is_executable($binary)) {
+        $build = proc_open(
+            [$phpc, 'build', '--project', $project],
+            [0 => ['pipe', 'r'], 1 => ['pipe', 'w'], 2 => ['pipe', 'w']],
+            $pipes,
+            $repoRoot,
+            $env
+        );
+        if (!is_resource($build)) {
+            check_sessions_web_cleanup($sessionDir);
+
+            return false;
+        }
+        fclose($pipes[0]);
+        stream_get_contents($pipes[1]);
+        $stderr = stream_get_contents($pipes[2]);
+        fclose($pipes[1]);
+        fclose($pipes[2]);
+        if (0 !== proc_close($build)) {
+            check_sessions_web_cleanup($sessionDir);
+
+            return false;
+        }
+    }
+
+    if (!is_executable($binary)) {
+        check_sessions_web_cleanup($sessionDir);
 
-    return preg_match('/n\/a/i', $compileCol) && preg_match('/n\/a/i', $compiledCol);
+        return false;
+    }
+
+    $ok = check_sessions_web_flash_probe($repoRoot, $binary, $env);
+    check_sessions_web_cleanup($sessionDir);
+
+    return $ok;
+}
+
+/**
+ * @param array<string, string> $baseEnv
+ */
+function check_sessions_web_flash_probe(string $repoRoot, string $binary, array $baseEnv): bool
+{
+    $jar = new PHPCompiler\CgiCookieJar();
+    $empty = check_run_binary($repoRoot, $binary, array_merge($baseEnv, PHPCompiler\SessionsWebCgiEnv::getEmpty()));
+    if (null === $empty) {
+        return false;
+    }
+    $jar->absorbFromCgiOutput($empty);
+    if (!$jar->hasCookie('PHPSESSID')) {
+        return false;
+    }
+    $cookie = $jar->httpCookieHeader();
+    if (null === check_run_binary(
+        $repoRoot,
+        $binary,
+        array_merge($baseEnv, PHPCompiler\SessionsWebCgiEnv::postFlash('Saved'), ['HTTP_COOKIE' => $cookie])
+    )) {
+        return false;
+    }
+    $flash = check_run_binary(
+        $repoRoot,
+        $binary,
+        array_merge($baseEnv, PHPCompiler\SessionsWebCgiEnv::getEmpty(), ['HTTP_COOKIE' => $jar->httpCookieHeader()])
+    );
+    if (null === $flash) {
+        return false;
+    }
+
+    return str_contains($flash, 'Flash: Saved');
+}
+
+/**
+ * @param array<string, string> $env
+ */
+function check_run_binary(string $repoRoot, string $binary, array $env): ?string
+{
+    $proc = proc_open(
+        [$binary],
+        [0 => ['pipe', 'r'], 1 => ['pipe', 'w'], 2 => ['pipe', 'w']],
+        $pipes,
+        $repoRoot,
+        $env
+    );
+    if (!is_resource($proc)) {
+        return null;
+    }
+    fclose($pipes[0]);
+    $stdout = stream_get_contents($pipes[1]);
+    fclose($pipes[1]);
+    fclose($pipes[2]);
+    if (0 !== proc_close($proc)) {
+        return null;
+    }
+
+    return false !== $stdout ? $stdout : '';
+}
+
+function check_sessions_web_cleanup(string $sessionDir): void
+{
+    if (!is_dir($sessionDir)) {
+        return;
+    }
+    foreach (glob($sessionDir.'/sess_*') ?: [] as $file) {
+        @unlink($file);
+    }
+    @rmdir($sessionDir);
 }
diff --git a/script/rebuild-examples.php b/script/rebuild-examples.php
index f80f23a06..c2db46a61 100644
--- a/script/rebuild-examples.php
+++ b/script/rebuild-examples.php
@@ -10,6 +10,8 @@
  */
 
 require_once __DIR__.'/../vendor/autoload.php';
+require_once __DIR__.'/../test/support/CgiCookieJar.php';
+require_once __DIR__.'/../test/support/SessionsWebCgiEnv.php';
 
 echo "Rebuilding Examples\n";
 
@@ -194,7 +196,8 @@ function exampleDisplayName(string $example): string
  *     aot_compile_time_query: bool,
  *     aot_run_env: array<string, string>,
  *     skip_aot: bool,
- *     project_aot: bool
+ *     project_aot: bool,
+ *     sessions_web_project_aot: bool
  * }
  */
 function exampleProfile(string $example): array
@@ -212,18 +215,19 @@ function exampleProfile(string $example): array
             'aot_run_env' => [],
             'skip_aot' => false,
             'project_aot' => true,
+            'sessions_web_project_aot' => false,
         ];
     }
 
     if ('005-SessionsWeb' === exampleDisplayName($example)) {
-        // AOT columns stay n/a until two-request session execute is green (#1891).
         return [
             'query' => null,
             'cgi_env' => [],
             'aot_compile_time_query' => true,
             'aot_run_env' => [],
-            'skip_aot' => true,
+            'skip_aot' => false,
             'project_aot' => false,
+            'sessions_web_project_aot' => true,
         ];
     }
 
@@ -240,6 +244,7 @@ function exampleProfile(string $example): array
             ],
             'skip_aot' => false,
             'project_aot' => false,
+            'sessions_web_project_aot' => false,
         ];
     }
 
@@ -250,6 +255,7 @@ function exampleProfile(string $example): array
         'aot_run_env' => [],
         'skip_aot' => false,
         'project_aot' => false,
+        'sessions_web_project_aot' => false,
     ];
 }
 
@@ -479,6 +485,139 @@ function tryBenchmarkMiniWebAppProjectAot(string $repoRoot, array $benchEnv, arr
     return ['compile' => $compileTime, 'compiled' => $compiledTime];
 }
 
+/**
+ * phpc build --project + two-request session flash for 005-SessionsWeb (#1891, #1973).
+ *
+ * @param array<string, string> $benchEnv
+ *
+ * @return array{compile: float, compiled: float}|null
+ */
+function tryBenchmarkSessionsWebProjectAot(string $repoRoot, array $benchEnv): ?array
+{
+    if ('0' === getenv('BENCH_SESSIONSWEB_AOT')) {
+        echo "  005-SessionsWeb AOT: skip (BENCH_SESSIONSWEB_AOT=0)\n";
+
+        return null;
+    }
+
+    $project = $repoRoot.'/examples/005-SessionsWeb';
+    $phpc = $repoRoot.'/phpc';
+    $binary = $project.'/.phpc/bin/app';
+
+    if (!is_executable($phpc)) {
+        echo "  005-SessionsWeb AOT: skip (phpc not executable)\n";
+
+        return null;
+    }
+
+    $sessionDir = sys_get_temp_dir().'/phpc_bench_sessionsweb_'.uniqid('', true);
+    if (!@mkdir($sessionDir, 0700, true) && !is_dir($sessionDir)) {
+        echo "  005-SessionsWeb AOT: skip (session temp dir)\n";
+
+        return null;
+    }
+
+    $aotEnv = $benchEnv;
+    $aotEnv['PHP_COMPILER_SESSION_DIR'] = $sessionDir;
+
+    $compileStart = microtime(true);
+    $build = runProcessCapturing(
+        [$phpc, 'build', '--project', $project],
+        $aotEnv,
+        $repoRoot
+    );
+    $compileTime = microtime(true) - $compileStart;
+
+    if (0 !== $build['exit']) {
+        $stderr = $build['stderr'];
+        if (\PHPCompiler\Cli\PhpcBuild::isUserClassAotBlocked($stderr)) {
+            echo '  005-SessionsWeb AOT: skip (link blocked: '.trim(substr($stderr, 0, 120))."…)\n";
+        } else {
+            echo "  005-SessionsWeb AOT: skip (phpc build --project exit {$build['exit']})\n";
+        }
+        sessionsWebBenchCleanup($sessionDir);
+
+        return null;
+    }
+
+    if (!is_executable($binary)) {
+        echo "  005-SessionsWeb AOT: skip (binary missing after link)\n";
+        sessionsWebBenchCleanup($sessionDir);
+
+        return null;
+    }
+
+    if (!sessionsWebAotFlashProbe($repoRoot, $binary, $aotEnv)) {
+        echo "  005-SessionsWeb AOT: skip (two-request flash probe failed)\n";
+        sessionsWebBenchCleanup($sessionDir);
+
+        return null;
+    }
+
+    $iterations = 10;
+    $compiledStart = microtime(true);
+    for ($i = 0; $i < $iterations; ++$i) {
+        sessionsWebAotFlashProbe($repoRoot, $binary, $aotEnv);
+    }
+    $compiledTime = (microtime(true) - $compiledStart) / $iterations;
+
+    sessionsWebBenchCleanup($sessionDir);
+
+    return ['compile' => $compileTime, 'compiled' => $compiledTime];
+}
+
+/**
+ * @param array<string, string> $baseEnv
+ */
+function sessionsWebAotFlashProbe(string $repoRoot, string $binary, array $baseEnv): bool
+{
+    $jar = new \PHPCompiler\CgiCookieJar();
+    $empty = runProcessCapturing(
+        [$binary],
+        array_merge($baseEnv, \PHPCompiler\SessionsWebCgiEnv::getEmpty()),
+        $repoRoot
+    );
+    if (0 !== $empty['exit']) {
+        return false;
+    }
+    $jar->absorbFromCgiOutput($empty['stdout']);
+    if (!$jar->hasCookie('PHPSESSID')) {
+        return false;
+    }
+
+    $cookie = $jar->httpCookieHeader();
+    $post = runProcessCapturing(
+        [$binary],
+        array_merge($baseEnv, \PHPCompiler\SessionsWebCgiEnv::postFlash('Saved'), ['HTTP_COOKIE' => $cookie]),
+        $repoRoot
+    );
+    if (0 !== $post['exit']) {
+        return false;
+    }
+
+    $flash = runProcessCapturing(
+        [$binary],
+        array_merge($baseEnv, \PHPCompiler\SessionsWebCgiEnv::getEmpty(), ['HTTP_COOKIE' => $jar->httpCookieHeader()]),
+        $repoRoot
+    );
+    if (0 !== $flash['exit']) {
+        return false;
+    }
+
+    return str_contains($flash['stdout'], 'Flash: Saved');
+}
+
+function sessionsWebBenchCleanup(string $sessionDir): void
+{
+    if (!is_dir($sessionDir)) {
+        return;
+    }
+    foreach (glob($sessionDir.'/sess_*') ?: [] as $file) {
+        @unlink($file);
+    }
+    @rmdir($sessionDir);
+}
+
 /**
  * @param list<string> $argv
  * @param array<string, string> $env
@@ -543,7 +682,13 @@ function benchmarkExample(string $example, array $phpCmd, array $benchEnv, strin
 
     $compileTime = null;
     $compiledTime = null;
-    if ($llvmReady && !empty($profile['project_aot'])) {
+    if ($llvmReady && !empty($profile['sessions_web_project_aot'])) {
+        $sessionsAot = tryBenchmarkSessionsWebProjectAot($repoRoot, $benchEnv);
+        if (null !== $sessionsAot) {
+            $compileTime = $sessionsAot['compile'];
+            $compiledTime = $sessionsAot['compiled'];
+        }
+    } elseif ($llvmReady && !empty($profile['project_aot'])) {
         $projectAot = tryBenchmarkMiniWebAppProjectAot($repoRoot, $benchEnv, $profile);
         if (null !== $projectAot) {
             $compileTime = $projectAot['compile'];
diff --git a/test/unit/RebuildExamples005RowTest.php b/test/unit/RebuildExamples005RowTest.php
index 936db4f34..d08ad4003 100644
--- a/test/unit/RebuildExamples005RowTest.php
+++ b/test/unit/RebuildExamples005RowTest.php
@@ -29,5 +29,8 @@ public function testRebuildExamples005RowCheckerScriptDocumentsPolicy(): void
         $this->assertStringContainsString('005-SessionsWeb', $script);
         $this->assertStringContainsString('benchmark table start', $script);
         $this->assertStringContainsString('#1891', $script);
+        $this->assertStringContainsString('BENCH_SESSIONSWEB_AOT', $script);
+        $this->assertStringContainsString('sessions_web_aot_execute_probe', $script);
+        $this->assertStringContainsString('#1973', $script);
     }
 }
diff --git a/test/unit/RebuildExamplesTest.php b/test/unit/RebuildExamplesTest.php
index 10e41316e..0e85a5fa2 100644
--- a/test/unit/RebuildExamplesTest.php
+++ b/test/unit/RebuildExamplesTest.php
@@ -44,8 +44,11 @@ public function testRebuildExamplesDocumentsSessionsWebBenchmarkGate(): void
         $this->assertStringContainsString('BENCH_SESSIONSWEB', $script);
         $this->assertStringContainsString('SESSIONSWEB_LINT_GATE', $script);
         $this->assertStringContainsString('examples/005-SessionsWeb', $script);
-        $this->assertStringContainsString("'skip_aot' => true", $script);
+        $this->assertStringContainsString("'sessions_web_project_aot' => true", $script);
+        $this->assertStringContainsString('tryBenchmarkSessionsWebProjectAot', $script);
+        $this->assertStringContainsString('BENCH_SESSIONSWEB_AOT', $script);
         $this->assertStringContainsString('#1891', $script);
+        $this->assertStringContainsString('#1973', $script);
 
         $readme = file_get_contents(dirname(__DIR__, 2).'/examples/README.md');
         $this->assertNotFalse($readme);