<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by SEA_Tigger:A 757-200 has three doors on each side.
A 767-200 has two doors on each side and a single overwing exit.
A 767-300ER has two doors on each side and two overwing exits.</font>
Some 757-200's (not United's)have a fourth door on each side (inplace of the window exits).
Some 767-300's (not United's)have a third door on each side.
757 and 767 have four wheeled trucks for the center landing gear, 777 have six wheeled trucks.