In a statement, the Federal Aviation Administration said United Flight 863 heading to Sydney, Australia and United Flight 877 bound for Hong Kong were the two planes involved. Flight 863’s left wingtip collided with the right wingtip of Flight 877 about 12:35 a.m., the FAA said.

Two United Airlines jets made contact during an incident at International Airport Monday night, prompting the cancellation of both flights.

United Airlines says its forced to cancel 35 daily flights from Newark due to staffing and technology issues at the airport, a major hub.