What terminal is Delta located in at JFK Airport?

As of 2015, Delta is located in both Terminal 2 and Terminal 4, according to the Port Authority of New York and New Jersey. You can find Delta in Terminal 2 for domestic flights and in Terminal 4 for international flights and flights going to LAX, SFO and SEA airports.

For domestic flights, apart from those heading to LAX, SFO, and SEA, you can reach Delta at (800) 221-1212 and visit their service desks in Terminal 2. For international flights, as well as those heading to Los Angeles (LAX), San Fransisco (SFO) and Seattle (SEA), you can reach Delta at (800) 241-4141 or visit their service desks in Terminal 4