Double-check your United Airlines reservations each week as you prepare for your trip!
After more than three hours on the phone in two separate phone calls, I got them reinstated with a different outbound flight schedule to Kauai. The United rep. said that over 14,000 reservations disappeared. I think it was because they changed a fight number and routing that we'd been reserved on, the computer didn't know how to rebook it, so it tossed it out.
The merger pains with United/Continental continue, they are constantly changing flight numbers, routings and schedules, so stay on top of your reservations weekly. The United supervisor said this is a very good idea, especially now.