Promo code DCMIDWEST will get you 10% off at Midwestairlines.com on tickets purchased through November 30, 2005 for travel through February 17, 2006.

It’s a Diners Club card promo but terms and conditions don’t seem to require use of a Diners Club card (and the Midwest Airlines website probably wouldn’t even know if you were using one anyway, now that Diners Club is just a Mastercard — at most they’d be able to restrict payment to Mastercards but they probably don’t even do that).

Travel from November 23 to 27 and December 22 to January 2, 2006 is blacked out from the discount.