Have been on hold twice today using Ticketing number. 2.75 hours this afternoon (had to hang up to go to a meeting) and 45 minutes just now. The very helpful person I talked to just now was not Ticketing, but probably general travel booking. He told me the call-backs were used when queues were under X number of hours. Once they hit the limit, the call-back and wait time messages stopped. And, when there were enough calls in the queue to get to closing time, calls are shifted to the general booking line. Agent said to call in morning for best results, and he expected the waits to be this long for the next 3-4 weeks. YMMV, because Reps have been known to differ on explanations, but what he said made sense to me.