There have been several incidents in recent months in which airplanes have either collided with one another or with other objects and vehicles at airports, and one more has been added to the list at Chicago O’Hare involving planes of American Airlines and United Airlines.

Hundreds of passengers were moved from their flights at Chicago's O'Hare International Airport Wednesday after an American Airlines plane clipped a United Airlines aircraft.

"It felt like we hit a pothole. Some people felt it, some didn't. Nonetheless, a few minutes later, the pilot got on the PA and said that we had tail strike," Lewis said.

American Airlines has recently taken delivery of a new Boeing 737 MAX 8, registered as N315UA—a tail number once used by United Airlines. The aircraft, which arrived in the airline's fleet on December 24,