No, this isn’t a drawing of 9/11, but rather this was drawn two years earlier for Lilo & Stitch.
When I was working on Lilo & Stitch in 1999, there was a scene where Stitch hijacks a 747 while attempting to escape capture. This ensues a chase scene that takes the jumbo jet throughout Honolulu; in this scene Stitch takes the airliner into the heart of Honolulu.
I was working from Utah at the time as a freelancer, but from what I heard, the entire scene was animated and colored when 9/11 hit. At which point the company knew they could never release the movie with that scene…so it was pulled and redone. The chase scene that ended up in the final version of the movie was the alien spaceship being chased through the Hawaiian mountains.
This was drawn with Prismacolor pencil and vellum. There was no Photoshop or other computer program used to create this effect. It was done purely old-school.