Do you assign your seats when you buy tickets with Midwest? Or is it Open Seating/check-in at the airport? We're debating Southwest, Midwest or Air Tran. SW or Midwest, we'd have to drive about 3 1/2 hours to the airport, but we'd have a nonstop flight (with 3 kids, this would be a huge blessing for us). I'm willing to pay a bit more for Midwest flights if I don't have to stress about open seating. Air Tran flies out of our hometown, but the only non-stop day/time doesn't work for us. And no assigned seating until check-in for the fare we'd use. So Midwest is winning if I can get my seat assignments when purchasing. TIA!