What was the last order of pizzas made to the twin towers? 2 large plains
That joke probably wouldn't sit well with a lot of people.
No but I fail to see the humor because it doesn't include the toppings
While your joke most likely had the intention to just make someone laugh, I do not think you should talk about 911 like this. 9/11 was such a traumatic event for us Americans that making jokes about it are sort of off limits for the most part. Hopefully you understand how it may come across as insensitive to joke in this way.