Northwest Airlines on Friday said it closed a deal to buy bankrupt regional carrier Mesaba, although The Associated Press reports it is not clear whether Mesaba's parent company, MAIR, accepted the offer. According to The AP, the agreement calls for $145 million to be paid to Mesaba's bankruptcy estate, of which MAIR is a creditor, as well as $10 million in cash for Mesaba to use as operating money. Both carriers are bankrupt and judges would need to approve the deal. Spokespeople for MAIR had no comment, The AP said.