Citing high fuel costs, discount-carrier ATA says it will slash flights out of Chicago Midway (MDW) Airport over the next couple months, including dropping Oakland - Chicago service effective April 14th. ATA once dominated Midway Airport, but since emerging from Bankruptcy a couple years back, cutting routes and expanding code share service with Southwest Airlines, less ATA can be found at MDW.ATA says its scheduled service to Hawai'i and other Charter flights are not affected by the announcement.Passengers who have purchased tickets on the Oakland-Midway route for travel after April 14th will receive a full refund.