Flights were grounded at Newark International Airport in the US state of New Jersey after two drones were spotted flying nearby.
A pilot told air traffic control that one of the drones came within 30ft (9m) of his aircraft.
He was flying at Teterboro Airport, a nearby private facility, but officials closed Newark International as a precaution.
The airport is the 11th busiest in the US, with 20m boarding there each year.
The incident follows major disruption over the Christmas period at London’s Gatwick airport, where apparent drone sightings grounded hundreds of flights over the course of three days.