But retiring those "old" 757 not maintained by sUA mechanics are leaving the fleet. How can we still have so many mechanical issues. Are those fancy 739's with no tv, no audio and no wifi having issues or is it the 737's are prone to more mechanical delays.

Going all Boeing was a mistake. The 321 should've replaced the 757's, but again those old not maintained 757's had another 5 years at least.

Another bad move by the new UA. UA needed a smaller aircraft to eliminate Express but we get these shinny 739 with fancy blue lights and nothing else.