The rumors started swirling yesterday, and it was confirmed overnight. ATA is shutting down effective this morning. They lost their military contract, and so they’re done. I’ll have more on this tomorrow (my regular post here today will be up soon). If you were booked on them, try to get a refund from your credit card or see if any other airline will accommodate you. If you booked them via a Southwest codeshare, Southwest will take care of you.