this time by a separate airliner delta flight 407 prepares to land at jfk airport, with 154 people on board. when the pilot spots a drone on the southwest side of the plane, just about 100 feet below. the pilot immediately contacts air traffic control. did you by any chance get the color or type? no it is not close enough to be able to tell. reporter: then jfk tower warned other pilots of the possible danger flying around them. jetblue, use caution on arrival, the one that s ahead of you reported a drone. we re watching out for it. reporter: phil dernerh weighed in saying without a doubt this was a close call. explains a drone flying within 100 feet of a plane can get sucked into an engine or worse.