Boeing might have sent someone as well........the company that makes it.......i remember Bruce told me.........who worked for american, when u r on a plane, the best way to tell them apart is by the seating arrangement.......a dc10 had like 3 and 2........a 747 had 2 7 and then 2 window seats or something.....seven in the center, 3 rows of seats, a dc 10 had two, something like that, my memory is off, i was a kid back then.

They all are slightly different.....i forget the exact seating arrangement, but each type is unique, accord to bruce..

It was a 757..

American Airlines Flight 77, which was hijacked and crashed into the Pentagon on September 11, 2001, was a Boeing 757-223.