diff --git a/README.md b/README.md
index d694fee..27c53cf 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ spark.readStream.format("fake").load().writeStream.format("console").start()
 | [GoogleSheetsDataSource](pyspark_datasources/googlesheets.py)          | `googlesheets` | Read table from public Google Sheets        | None                  |
 | [KaggleDataSource](pyspark_datasources/kaggle.py)                      | `kaggle`       | Read datasets from Kaggle                    | `kagglehub`, `pandas` |
 | [SimpleJsonDataSource](pyspark_datasources/simplejson.py)              | `simplejson`   | Write JSON data to Databricks DBFS                 | `databricks-sdk`      |
+| [OpenSkyDataSource](pyspark_datasources/opensky.py)                 | `opensky`      | Read from OpenSky Network.                   | None                  |
 
 See more here: https://allisonwang-db.github.io/pyspark-data-sources/.
 
diff --git a/pyspark_datasources/opensky.py b/pyspark_datasources/opensky.py
new file mode 100644
index 0000000..94b5426
--- /dev/null
+++ b/pyspark_datasources/opensky.py
@@ -0,0 +1,350 @@
+"""
+OpenSky Network Data Source for Apache Spark - Academic/Private Use Example
+
+This module provides a custom Spark data source for streaming real-time aircraft tracking data from the OpenSky Network API (https://opensky-network.org/). The OpenSky Network is a community-based receiver network that collects air traffic surveillance data and makes it available as open data to researchers and enthusiasts.
+
+Features:
+- Real-time streaming of aircraft positions, velocities, and flight data
+- Support for multiple geographic regions (Europe, North America, Asia, etc.)
+- OAuth2 authentication for higher API rate limits (4000 vs 100 calls/day)
+- Robust error handling with automatic retries and rate limiting
+- Data validation and type-safe parsing of aircraft state vectors
+- Configurable bounding boxes for focused data collection
+
+Usage Example (Academic/Research):
+    # Basic usage with region NORTH_AMERICA
+    df = spark.readStream.format("opensky").load()
+    
+    # With specific region and authentication
+    df = spark.readStream.format("opensky") \
+        .option("region", "EUROPE") \
+        .option("client_id", "your_research_client_id") \
+        .option("client_secret", "your_research_client_secret") \
+        .load()
+
+Data Schema:
+    Each record contains comprehensive aircraft information including position (lat/lon),altitude, velocity, heading, call sign, ICAO identifier, and various flight status flags. All timestamps are in UTC timezone for consistency.
+
+Feed your own data to OpenSky Network https://opensky-network.org/feed
+
+Rate Limits & Responsible Usage:
+    - Anonymous access: 100 API calls per day
+    - Authenticated access: 4000 API calls per day (research accounts)
+    - Minimum 5-second interval between requests
+    - 8000 API calls if you feed your own data to the OpenSky Network feed (https://opensky-network.org/feed)
+
+Data Attribution:
+    When using this data in research or publications, please cite:
+    "The OpenSky Network, https://opensky-network.org"
+
+Author: Frank Munz, Databricks  - Example Only, No Warranty
+Purpose: Educational Example / Academic Research Tool
+Version: 1.0
+Last Updated: July-2025
+
+================================================================================
+LEGAL NOTICES & TERMS OF USE
+
+USAGE RESTRICTIONS:
+- Academic research and educational purposes only
+- Commercial use requires explicit permission from OpenSky Network
+- Must comply with OpenSky Network Terms of Use: https://opensky-network.org/about/terms-of-use
+
+If you create a publication (including web pages, papers published by a third party, and publicly available presentations) using data from the OpenSky Network data set, you should cite the original OpenSky paper as follows:
+
+Matthias Schäfer, Martin Strohmeier, Vincent Lenders, Ivan Martinovic and Matthias Wilhelm.
+"Bringing Up OpenSky: A Large-scale ADS-B Sensor Network for Research".
+In Proceedings of the 13th IEEE/ACM International Symposium on Information Processing in Sensor Networks (IPSN), pages 83-94, April 2014.
+
+
+DISCLAIMER & LIABILITY:
+This code is provided "AS IS" for educational purposes only. The author and Databricks make no warranties, express or implied, and disclaim all liability for any damages, losses, or issues arising from the use of this code. Users assume full responsibility for compliance with all applicable terms of service, laws, and regulations. Use at your own risk.
+
+For commercial use, contact OpenSky Network directly.
+================================================================================
+
+
+"""
+
+
+import requests
+import time
+from datetime import datetime, timezone
+from typing import Dict, List, Tuple, Any, Optional, Iterator
+from dataclasses import dataclass
+from requests.adapters import HTTPAdapter
+from requests.packages.urllib3.util.retry import Retry
+from enum import Enum
+
+from pyspark.sql.datasource import SimpleDataSourceStreamReader, DataSource
+from pyspark.sql.types import *
+
+DS_NAME = "opensky"
+
+@dataclass
+class BoundingBox:
+    lamin: float  # Minimum latitude
+    lamax: float  # Maximum latitude
+    lomin: float  # Minimum longitude
+    lomax: float  # Maximum longitude
+
+class Region(Enum):
+    EUROPE = BoundingBox(35.0, 72.0, -25.0, 45.0)
+    NORTH_AMERICA = BoundingBox(7.0, 72.0, -168.0, -60.0)
+    SOUTH_AMERICA = BoundingBox(-56.0, 15.0, -90.0, -30.0)
+    ASIA = BoundingBox(-10.0, 82.0, 45.0, 180.0)
+    AUSTRALIA = BoundingBox(-50.0, -10.0, 110.0, 180.0)
+    AFRICA = BoundingBox(-35.0, 37.0, -20.0, 52.0)
+    GLOBAL = BoundingBox(-90.0, 90.0, -180.0, 180.0)
+
+class OpenSkyAPIError(Exception):
+    """Base exception for OpenSky API errors"""
+    pass
+
+class RateLimitError(OpenSkyAPIError):
+    """Raised when API rate limit is exceeded"""
+    pass
+
+class OpenSkyStreamReader(SimpleDataSourceStreamReader):
+    
+    DEFAULT_REGION = "NORTH_AMERICA"
+    MIN_REQUEST_INTERVAL = 5.0  # seconds between requests
+    ANONYMOUS_RATE_LIMIT = 100  # calls per day
+    AUTHENTICATED_RATE_LIMIT = 4000  # calls per day
+    MAX_RETRIES = 3
+    RETRY_BACKOFF = 2
+    RETRY_STATUS_CODES = [429, 500, 502, 503, 504]
+    
+    def __init__(self, schema: StructType, options: Dict[str, str]):
+        super().__init__()
+        self.schema = schema
+        self.options = options
+        self.session = self._create_session()
+        self.last_request_time = 0
+        
+        region_name = options.get('region', self.DEFAULT_REGION).upper()
+        try:
+            self.bbox = Region[region_name].value
+        except KeyError:
+            print(f"Invalid region '{region_name}'. Defaulting to {self.DEFAULT_REGION}.")
+            self.bbox = Region[self.DEFAULT_REGION].value
+        
+        self.client_id = options.get('client_id')
+        self.client_secret = options.get('client_secret')
+        self.access_token = None
+        self.token_expires_at = 0
+        
+        if self.client_id and self.client_secret:
+            self._get_access_token()  # OAuth2 authentication
+            self.rate_limit = self.AUTHENTICATED_RATE_LIMIT
+        else:
+            self.rate_limit = self.ANONYMOUS_RATE_LIMIT
+
+    def _get_access_token(self):
+        """Get OAuth2 access token using client credentials flow"""
+        current_time = time.time()
+        if self.access_token and current_time < self.token_expires_at:
+            return  # Token still valid
+            
+        token_url = "https://auth.opensky-network.org/auth/realms/opensky-network/protocol/openid-connect/token"
+        data = {
+            "grant_type": "client_credentials",
+            "client_id": self.client_id,
+            "client_secret": self.client_secret
+        }
+        
+        try:
+            response = requests.post(token_url, data=data, timeout=10)
+            response.raise_for_status()
+            token_data = response.json()
+            
+            self.access_token = token_data["access_token"]
+            expires_in = token_data.get("expires_in", 1800)
+            self.token_expires_at = current_time + expires_in - 300
+            
+        except requests.exceptions.RequestException as e:
+            raise OpenSkyAPIError(f"Failed to get access token: {str(e)}")
+
+    def _create_session(self) -> requests.Session:
+        """Create and configure requests session with retry logic"""
+        session = requests.Session()
+        retry_strategy = Retry(
+            total=self.MAX_RETRIES,
+            backoff_factor=self.RETRY_BACKOFF,
+            status_forcelist=self.RETRY_STATUS_CODES
+        )
+        adapter = HTTPAdapter(max_retries=retry_strategy)
+        session.mount("https://", adapter)
+        session.mount("http://", adapter)
+        return session
+
+    def initialOffset(self) -> Dict[str, int]:
+        return {'last_fetch': 0}
+
+    def _handle_rate_limit(self):
+        """Ensure e MIN_REQUEST_INTERVAL seconds between requests"""
+        current_time = time.time()
+        time_since_last_request = current_time - self.last_request_time
+        
+        if time_since_last_request < self.MIN_REQUEST_INTERVAL:
+            sleep_time = self.MIN_REQUEST_INTERVAL - time_since_last_request
+            time.sleep(sleep_time)
+        
+        self.last_request_time = time.time()
+
+    def _fetch_states(self) -> requests.Response:
+        """Fetch states from OpenSky API with error handling"""
+        self._handle_rate_limit()
+        
+        if self.client_id and self.client_secret:
+            self._get_access_token()
+        
+        params = {
+            'lamin': self.bbox.lamin,
+            'lamax': self.bbox.lamax,
+            'lomin': self.bbox.lomin,
+            'lomax': self.bbox.lomax
+        }
+        
+        headers = {}
+        if self.access_token:
+            headers['Authorization'] = f'Bearer {self.access_token}'
+        
+        try:
+            response = self.session.get(
+                "https://opensky-network.org/api/states/all",
+                params=params,
+                headers=headers,
+                timeout=10
+            )
+            
+            if response.status_code == 429:
+                raise RateLimitError("API rate limit exceeded")
+            response.raise_for_status()
+            
+            return response
+            
+        except requests.exceptions.RequestException as e:
+            error_msg = f"API request failed: {str(e)}"
+            if isinstance(e, requests.exceptions.Timeout):
+                error_msg = "API request timed out"
+            elif isinstance(e, requests.exceptions.ConnectionError):
+                error_msg = "Connection error occurred"
+            raise OpenSkyAPIError(error_msg) from e
+
+    def valid_state(self, state: List) -> bool:
+        """Validate state data"""
+        if not state or len(state) < 17:
+            return False
+        
+        return (state[0] is not None and  # icao24
+                state[5] is not None and  # longitude
+                state[6] is not None)     # latitude
+
+    def parse_state(self, state: List, timestamp: int) -> Tuple:
+        """Parse state data with safe type conversion"""
+        def safe_float(value: Any) -> Optional[float]:
+            try:
+                return float(value) if value is not None else None
+            except (ValueError, TypeError):
+                return None
+
+        def safe_int(value: Any) -> Optional[int]:
+            try:
+                return int(value) if value is not None else None
+            except (ValueError, TypeError):
+                return None
+
+        def safe_bool(value: Any) -> Optional[bool]:
+            return bool(value) if value is not None else None
+
+        return (
+            datetime.fromtimestamp(timestamp, tz=timezone.utc),
+            state[0],  # icao24
+            state[1],  # callsign
+            state[2],  # origin_country
+            datetime.fromtimestamp(state[3], tz=timezone.utc),
+            datetime.fromtimestamp(state[4], tz=timezone.utc),
+            safe_float(state[5]),  # longitude
+            safe_float(state[6]),  # latitude
+            safe_float(state[7]),  # geo_altitude
+            safe_bool(state[8]),  # on_ground
+            safe_float(state[9]),  # velocity
+            safe_float(state[10]),  # true_track
+            safe_float(state[11]),  # vertical_rate
+            state[12],  # sensors
+            safe_float(state[13]),  # baro_altitude
+            state[14],  # squawk
+            safe_bool(state[15]),  # spi
+            safe_int(state[16])  # category
+        )
+
+    def readBetweenOffsets(self, start: Dict[str, int], end: Dict[str, int]) -> Iterator[Tuple]:
+        data, _ = self.read(start)
+        return iter(data)
+        
+    def read(self, start: Dict[str, int]) -> Tuple[List[Tuple], Dict[str, int]]:
+        """Read states with error handling and backoff"""
+        try:
+            response = self._fetch_states()
+            data = response.json()
+            
+            valid_states = [
+                self.parse_state(s, data['time'])
+                for s in data.get('states', [])
+                if self.valid_state(s)
+            ]
+            
+            return (
+                valid_states,
+                {'last_fetch': data.get('time', int(time.time()))}
+            )
+            
+        except OpenSkyAPIError as e:
+            print(f"OpenSky API Error: {str(e)}")
+            return ([], start)
+        except Exception as e:
+            print(f"Unexpected error: {str(e)}")
+            return ([], start)
+
+class OpenSkyDataSource(DataSource):
+    def __init__(self, options: Dict[str, str] = None):
+        super().__init__(options or {})
+        self.options = options or {}
+        
+        if 'client_id' in self.options and not self.options.get('client_secret'):
+            raise ValueError("client_secret must be provided when client_id is set")
+        
+        if 'region' in self.options and self.options['region'].upper() not in Region.__members__:
+            raise ValueError(f"Invalid region. Must be one of: {', '.join(Region.__members__.keys())}")
+
+    @classmethod
+    def name(cls) -> str:
+        return DS_NAME
+
+    def schema(self) -> StructType:
+        return StructType([
+            StructField("time_ingest", TimestampType()),
+            StructField("icao24", StringType()),
+            StructField("callsign", StringType()),
+            StructField("origin_country", StringType()),
+            StructField("time_position", TimestampType()),
+            StructField("last_contact", TimestampType()),
+            StructField("longitude", DoubleType()),
+            StructField("latitude", DoubleType()),
+            StructField("geo_altitude", DoubleType()),
+            StructField("on_ground", BooleanType()),
+            StructField("velocity", DoubleType()),
+            StructField("true_track", DoubleType()),
+            StructField("vertical_rate", DoubleType()),
+            StructField("sensors", ArrayType(IntegerType())),
+            StructField("baro_altitude", DoubleType()),
+            StructField("squawk", StringType()),
+            StructField("spi", BooleanType()),
+            StructField("category", IntegerType())
+        ])
+
+    def simpleStreamReader(self, schema: StructType) -> OpenSkyStreamReader:
+        return OpenSkyStreamReader(schema, self.options)
+
+spark.dataSource.register(OpenSkyDataSource)
\ No newline at end of file