My mom has flown monthly MSP-MDW for 2 years... since ATA started in MSP in June 2000, I'd say she's completed about 14 round trips with them.
As far as flight delays, they sometimes have trouble in the evening when 10 and 15 min delays during the day add up.... fly in the AM and you shouldn't have any trouble. The 737-800s look very nice- never knew they had leather! MDW is a manageable airport, and less hassle than O'hare or Detroit.... although bad weather in Chicago can back things up. The new terminal construction is around check-in areas, but the gate layout is about the same. With ATA using maybe 10 gates, connections will be a snap.
FYI, you can book DCA-DSM for $188 round trip plus tax through their website-- that's an online sale fare. See
http://www.ata.com/whats_hot/sale011226.html Plus if you choose, book 2 additional trips on ATA by June 30 and get a free ticket for the US and Puerto Rico. A year ago, my mom and I went to San Juan on free tickets she received from her MSP-MDW trips.
Have a good trip.
[This message has been edited by Viajero Joven (edited 01-16-2002).]