A 767 aircraft was pushing back from its gate at Terminal 4 when its wingtip hit the tail section of another 767 jet, the FAA said.
"The aircraft were not in communication with air-traffic control when the incident occurred," the FAA said in a brief statement. "The incident did not impact airport operations."
An FAA spokeswoman said air traffic controllers do not have jurisdiction over the planes when they are in the ramp area. She said the agency was notified of the incident about 5:15 p.m.
The FAA said it did not have other details, including extent of the damage, flight numbers, whether any passengers were aboard and where the planes were headed.