The plane burst into flames and struck several vehicles on the ground.
Investigators from the NTSB arrived at Newark Liberty International Airport on Monday after a near catastrophe over the weekend.
A United Airlines flight struck a light pole while on final approach on Sunday afternoon, damaging a tractor-trailer traveling below and sending its driver to the hospital with minor injuries.
Federal aviation officials are investigating a United Airlines pilot's report that his aircraft reportedly struck a drone while landing at San Diego International Airport on Wednesday morning.
Two people were killed when a small plane they were aboard crashed on Catalina Island.
Pennsylvania State Police said the pilot and a passenger had departed Solberg, New Jersey, en route to Indiana when the pilot reported engine trouble over Pennsylvania.