A Newark-bound Southwest Airlines flight had to be diverted to Ohio Wednesday after one of the windows on the plane cracked.

Flight 957 had taken off from Midway Airport in Chicago around 8:30 a.m. Passenger Cara O’Grady says that the window cracked not long after the flight took off.

“We got up to about 30,000 feet…and all of a sudden I heard a pop, like someone had thrown something…at the window,” O’Grady tells News 12 New Jersey.

O’Grady says that she was sitting in the aisle seat of the row where the window cracked. She says that when she realized that the window was cracked, she immediately told a flight attendant and moved to the back of the plane.

“My heart sank for a second…and when I got to the back of the plane I realized, OK, we have pressure, there’s not cracking noise,” O’Grady says.

A Southwest Airlines spokeswoman says the plane never lost cabin pressure and the pilots didn't declare an emergency.

The plane landed in Cleveland and passengers were put on another flight to get to Newark. The second plane landed only an hour later than the flight was originally supposed to land.

O’Grady and the other passengers tell News 12 that the flight crew was very professional and kept everyone calm.

This is the latest in several incidents involving Southwest Airlines flights.

Flight 1380 was forced to make an emergency landing in Philadelphia after parts from an engine exploded. A woman was killed by the debris from the engine.

Flight 577 had to declare an emergency after a bird strike.