WORST.airline.EVER! People have been WAITING for HOURS to DAYS to catch a flight that they've already booked. This airline is a joke. They flew a plane that has an issue with the door sensor saying that it doesn't shut properly, "fix" it, plane finally gets to this airport after a delay and sits there again while the mechanics try and "fix" it again. We waited for 5hrs for the flight to be fixed, just for them to turn around and say it was canceled since there wasn't a crew to fly the plane. Why didn't they just take the plane out of commission and put in a new and working plane? Who knows. Completely incompetent. No meal voucher while everyone is waiting. Yes, we ended up getting a room, but no food accommodations nor any type of legitimate compensation for the MAJOR INCONVENIENCE. If this delay/cancelation was due to weather, I would have completely understood. First and last time flying with Delta unless they can provide better assistance.