Four airlines joined to build a new terinal at JFK in the early 1990s: Air France, Korean Air Lines, Japan Airlines and Lufthansa. They wanted to quit the awful T4.
This resulted in the Terminal One, built at the place of the former Eastern Airlines' one (don't know how it's called).
But there are actually many more operators at T1.
What are they? I know there are SIA, OS, OA, RAM. What are the others?
I assume they pay fees to the four owners.
Photo © Justin Cederholm - Orlando/Tampa Aviation Photography