There is one which filed but most of the employees and routes are still there - that would be TWA. They technically fell into chapter 7 (liquidation) and American bought out the assets.
No. TWA never filed chapter 7. Their asset sale was conducted as part of a pre-packaged chapter 11 filing where AA purchased "substantially all assets".
"The A340-300 may boast a long range, but the A340 is underpowered" -- Robert Milton, CEO - Air Canada