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My parents are arriving at JFK via Qatar airways QR83 at 1500 in Terminal 4.
They will be taking a United flight UA19 from Terminal 7 to SFO at 1905.
Is 4 hours sufficient to clear immigration and customs?
After clearing customs, is there a United counter in
Terminal 4 (international) to check-in their bags?
Or, do they need to take bags to Terminal 7 and check in
there?

Thanks for the help