We flew down on Christmas day and back on New Years day.
Our flights were booked online back in the summer. After the bankruptcy filing we were concerned so we double checked our schedule and completely freaked out when we went online to review our itinerary. There were some conflicts with flights like everyone has mentioned before, but we caught them early enough (sometime in October) and called their toll free number. They were very accomodating, and subsequent checks on our online itinerary continued to show us "confirmed" for the proper flights. The flights themselves were fine.
I would suggest just continuing to confirm the flights.
One other thing...you mention an hour and a half layover and I'm assuming that this is in Atlanta. When we landed, there were thunderstorms, so the baggage handling crews were sent back inside for safety reasons. This delayed our checked items from getting into the baggage claim area. When we finally claimed our luggage, we were kind of scrambling to get through customs and get our luggage rerouted back to our flights. We made it, but it reinforced the "carry-on" philosophy.