Originally Posted by
khergan
They're paid off and print money for UA so I doubt they will get retired until suitable replacements or a huge black swan occurs.
Airplanes can be flown nearly forever if you're willing to do the maintenance...just look at the C-5s and B-52s.
If those airplanes were flying 2 legs a day, every day, they would’ve been retired decades ago, and the USAF is not a for profit operation.