The current Midwest MasterCarrd promo code for travel booked online at www.midwestairlines.com is LG665. A 10% discount will be applied to base fares of $200 or more, not including taxes, fees, and surcharges. Tickets must be purchased by 1/31/2008 for travel completed by 2/13/2008. Promo code can only be used once, but is valid for any number of passengers booked under a single confirmation code.

Though the terms and conditions state that the code is only valid for travel paid with a Midwest MasterCard, it appears that the code also works with other branded MasterCards.

Other terms, conditions, and restrictions apply, such as not being valid in connection with other discounts or coupons, or for use with companion fare travel, Web fares, or group travel.

The code works on one-way fares, as well as for roundtrip travel. A minimum Friday or Saturday night stay is not required, so it's great for short business trips.

A new code is usually issued each quarter, with exclusions for peak travel times.