Two United Airlines planes collided at San Francisco International Airport on Labor Day. The incident occurred just after 9 p.m., when Flight UA1871, which was heading to Denver, Colorado, was pulling away from the gate. It collided with Boston-bound Flight UA796, which was at another gate boarding passengers at the time.

The Federal Aviation Administration said that Flight UA1871 was towed back to the gate , where passengers were deplaned without incident.

Luckily, none of the passengers on either flight were injured.

The passengers told KGO that the collision felt like an earthquake .

"I think that's probably a good description," NTSB News Talk Host Max Trescott told the news station. "You know, we're used to sitting in an airplane at the gate and things are very calm a

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