"Pilot shortage"
https://www.kxan.com/news/local/austin/after-nonpayment-via-airlines-will-no-longer-be-operating-out-of-abia/2029437056
They haven't paid the bulk of their employees for the month of May either. Pilots got paid though.
Can't afford to fix any of their aircraft. The one scheduled flight won't return until mid/late June and even that is a big maybe.
This has nothing to do with the pilot shortage. This has everything to do with terrible management decisions.