Southwest Airlines has pulled two planes from service after they bumped each other in Detroit Saturday morning.
Both were backing away from their gates at Detroit Metro Airport when the tips of their wings "made contact," Southwest spokesman Chris Mainz said.
Neither Boeing 737 aircraft appeared to have major damage, and no one was hurt, the spokesman added.
The 123 affected passengers were placed on other flights. Flight 3660 had been headed to Denver; Flight 2005 was going to St. Louis.
The two jets involved in the incident were grounded pending further inspection and repair.