https://greatawakening.win/p/12kFwbMmgh/anyone-remember-this-pentagon--h/c/
The number of shills making the same argument "A plane is a missile" and "I have people who actually witnessed the plane hitting the pentagon" and other reddit-style shilling makes you wonder if this was the real target ...
I doubt a land launch the most. That requires a rocket booster. Huge signature and risk of failure. (Booster fails, you have a 20ft missile in the middle of a street somewhere). If it fails from a sub, you send divers to recover it...or leave it under the ocean.