Two United Airlines planes collided on the tarmac at San Francisco International Airport (SFO) on Monday night, the airline and Federal Aviation Administration (FAA) have confirmed.

According to the FAA , which is investigating the event, “United Airlines flight 1871 struck United Airlines flight 796 while pushing back from the gate.” The airline explained the moving plane made contact with the tail of the parked United aircraft.

The collision occurred in “an area where air traffic controllers do not communicate with flights," per the FAA.

Typically, an Air Traffic Control Ground Controller communicates with the pilot, telling them when it is safe to push back from the gate and helping them navigate to the their takeoff position while crossing active runways, according to How Stu

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