Although some experts called it highly unlikely – primarily because of the weather – the FAA said a pair of drones were spotted flying 3,500 feet over Teterboro Airport, bumping flight times there and at Newark Liberty International Airport.“Two drones at once. In the dark. At 3500 feet altitude,” wrote Brendan Schulman , the vice-president of policy and legal affairs at DJI, which makes flying and camera stabilization systems. “It’s very cold outside, below freezing; not the kind of weather for flying drones. This is just not credible.”