I've been checking flights from JFK to HKG for early next year, and it seemed a bit weird that no tickets are available from after 12/27/25. This has been the case for a few days, so I was thinking maybe the tickets weren't released yet, and found out that it was the same between LAX and HKG. However, the agent on the phone told me it was because "all tickets [were] sold out". Seems a bit strange; has this happened before?