The wingtips of two United Airlines planes collided Wednesday shortly after the planes pushed back from their gates at O'Hare International Airport, authorities said.
No one was injured, but both aircraft incurred damage, United spokeswoman Megan McCarthy said.
"One of the aircraft started moving to go toward the taxiway, and they touched wingtips," McCarthy said. "The pilots put safety first, and both aircraft immediately returned to the gates."
All the passengers exited the damaged planes and were accommodated on other flights, she said.
The maintenance team was assessing the extent of the damages Wednesday evening.
There will be a full investigation into the collision, McCarthy said.