ATA has filed for Chap. 11 and discontinued ALL flights.

From their Web site, http://www.ata.com/index.html :

"Following the loss of a key contract for our military charter business, it became impossible for ATA to continue operations. Unfortunately, we were not in a position to provide our customers or others with advance notice.

ATA customers who purchased tickets using a credit card should contact their credit card company or travel agency directly for information about how to obtain a refund for unused tickets.

ATA currently is unable to provide refunds to customers who purchased tickets directly from ATA with cash or a check. These customers may be able to obtain a full or partial refund for their unused tickets by submitting a claim in ATA’s Chapter 11 proceedings."