Two airplanes bumped wingtips on the tarmac at Burbank Bob Hope Airport Saturday morning, according to Southwest Airlines.

No one was injured when the two Southwest planes clipped each other, the airline said in a statement.

Flight 4721 was pushing back from its gate at the airport gate when it clipped the wing of another plane. The planes were taken out of service and were slated for a maintenance check.

"Our Employees are working as quickly as possible to re-accommodate all Customers," a Southwest spokeswoman said in a statement.

Both planes were 737s, and both were being pushed back from their gates when the collision happened, according to Burbank Bobe Hope Airport spokeswoman Lucy Burghdorf. All passengers exited the planes, she said.

The NTSB is investigating the incident, but runways were never closed, Burghdorf said.