I am a traveler and recently visited the Delta Airlines ONT Terminal the personnel were welcoming and accommodating, helping me with my check-in and responding to my inquiries on my flights. I really enjoyed how quick and simple the check-in procedure was. It was pleasant to unwind before my trip in the tidy and cozy waiting area. I had a stress-free and easy visit to the Delta office at ONT overall. I would advise anyone taking a Delta Airlines flight to use this terminal!