767:  Speed Tape on the ADI, upgrade the engine sounds.  All the small items like cabin altitude have been addressed throughout the forums.

727: GPS select for the VOR to drive the autopilot.  Also, TCAS would be nice on the 727, and please fix the autopilot bugs.  The other issue with the 727 is the hydraulics - you should be able to work the ailerons, etc with the system A down (as in an engine failure), as system B would provide pressure - this however does not happen - an engine failure on the #1, and #2 engine means you cannot control the aircraft (unless I am doing something totally wrong).

757 - Please provide an American Airlines repaint - I can't find one anywhere  >:(

Otherwise the aircraft are GREAT!