Maybe an A.net member can help me since, apparently, airline agents can't:
As we speak, my mother and sister are on their way from Milan, Malpensa to JFK. They're on Alitalia AZ7602 which is a codeshare flight operated by Delta. They're scheduled to arrive at 3:10pm today. The Alitalia agent told me that the flight will arrive at terminal 1 while the Delta agent told me it will arrive at terminal 3. To top it off, the flight shows as non existent on Alitalia's online flight tracking system (even though it is in their timetable). Delta does have a flight estimated to come into JFK from Milan at 3:21pm, however it's flight # 85 (far from 7602).
Any idea which terminal I should go to? Any help would be greatly appreciated. Thanks in advance for all responses.