Southwest Airlines spokeswoman Brandy King said that the pilots chose to land in Cleveland "for maintenance review" of one layer in a multi-layered window pane.
The flight, traveling from Chicago's Midway Airport to Newark, New Jersey, was diverted to Cleveland Hopkins International Airport.
The incident comes two weeks after Jennifer Riordan was almost sucked out of the window of another Southwest flight when an exploding engine caused the glass to shatter midair.
One of the passenger windows had a crack on the outside, so the plane was diverted to Cleveland and the passengers were immediately put on another flight to complete their trip.
Flight WN 957 was forced to land in Cleveland, Ohio, after taking off from Chicago.
A Southwest spokesperson says the plane has been removed from service for maintenance review.
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Only once the plane was grounded did the reason for the emergency stop become clear.
Despite their terrifying ordeal, passengers were quick to praise the crew-especially the pilot-for the safe emergency landing. Another user added a video of flight attendants trying to calm passengers down once back on tarmac, and telling them to transfer to a different plane - waiting alongside them. "Everything ok but scary", one of her texts read. Just landed. Everything ok.
Southwest Airlines had another window shatter today on the heels of last month's horrendous incident that ended a woman's life. So far the cause of the crack is unknown.
Many passengers took to Twitter to reveal what happened onboard.
Local media quote passengers as saying that they heard a loud pop and were scared to see part of the window gone.
Mother-of-two Mrs Riordan died after the April 17 incident on the Southwest Airlines plane from Dallas to New York City, while seven people were injured.