- I had an uneventful flight with Sun Country ORD Terminal. Check-in was efficient, and the attendant was friendly and courteous. Security lines were efficient, and the whole pre-flight experience was seamless. The terminal itself was well-maintained and offered a reasonable variety of food and shops. Boarding was orderly, and the flight was comfortable given it was a budget airline. If you're traveling with Sun Country, anticipate a stress-free and enjoyable experience most certainly a wonderful choice for budget travel!