Planes are 80% full because the number of flights is minimal at best. Any meaningful travel rebound is going to take some time, to get to the level of travel accessibility before the virus might even take years.
Quite frankly the balance sheet is a disaster and their asset collateral is a bunch of depreciating planes, but who would even buy them if there is people aren't even traveling.
As of writing this, AAL is the third most popular stock on Robinhood, which in of itself tells me to short it.
As a sidenote, i really wat AAL to do well, my mother retired from American Airlines and I'd like it to stick around forever. Emotions aside, it is still a short for me until at least september