A Southwest Airlines spokeswoman says a plane forced to land in Cleveland because of a cracked window never lost cabin pressure.
Southwest has not said what it thinks caused the window to crack.
Another passenger, Linda Holley, texted her son Ryan with a picture of the damaged window, telling him: 'Window on plane cracked during flight. "The aircraft landed without incident at Cleveland".
We will remind that on April 17, a passenger plane Southwest airlines made an emergency landing at the airport of Philadelphia.
The Federal Aviation Administration (FAA) is investigating the incident. An emergency wasn't declared.
Flight 957 "maintained pressurisation" as there are multiple layers of panes in each window, the airline said.
This is the latest in several incidents involving Southwest Airlines flights.
Southwest has estimated a drop in sales as a result of the high-profile accident will cost it between $US50 million and $US100 million.
One of the plane's exterior windows was broken.
The airline has since ordered inspections of the engine model that failed on that flight, but a passenger has sued the airline, alleging post-traumatic stress disorder, anxiety, and depression.