I was a new guy (2 years) on the 747-400 for 9-11. When furloughs and bumps started, I bumped to the 777. I got bumped out of the 777 before I finished training

I could have bumped to a 767, but went to the Bus, because I saw it would have happened again.

Then, two years later, I was furloughed.

I would guess AS is similar. You can do a series of cascading bumps, and yes, guys can be trained many times. I was going to Training every four months. Very expensive and inefficient, but no other way when you have multiple aircraft types. United had 9 different types at the time.

Three of them had Flight engineers on 9-11. They were some of the first jets parked.