Two planes are out of service after a collision knocked the "S" out of Southwest on one of the aircraft.
On Saturday, two Southwest planes were pushing back from the gate at Nashville International Airport.
According to CNN, one was headed to St. Louis and the other to Atlanta.
They backed into each other, with one clipping the winglet of the other.
No injuries were reported, and the planes were able to return to the gates on their own.
The aircraft were taken out of service to be evaluated.