CLEVELAND (AP) — The Latest on a cracked window on a Southwest Airlines jet (all times local):

1:30 p.m.

Aviation experts say the slightest defect or micro-crack in a plane window can cause cracks like the one that forced a Southwest Airlines jet to land in Cleveland.

A Southwest spokeswoman says Flight 957 traveling from Chicago to New Jersey never lost cabin pressure and that the pilots didn't declare an emergency before landing Wednesday morning.

There were no reports of injuries.

Airline consultant Robert Mann says windows are periodically polished to remove the formation of tiny cracks in the acrylic windows from exposure to chemicals and the sun's rays.

He says the pilots were right to make a quick landing.

Anthony Roman, a commercial pilot and flight instructor based in New York, says problems with windows should be detected during regular inspections and maintenance.

___

12:45 p.m.

A Southwest Airlines spokeswoman says a plane forced to land in Cleveland because of a cracked window never lost cabin pressure.

Spokeswoman Brandy King also says the pilots didn't declare an emergency before landing Wednesday morning.

There were no reports of injuries after Flight 957 traveling from Chicago to New Jersey landed safely.

Southwest says there were no other mechanical problems with the plane that has been taken out of service.

The emergency landing comes two weeks after a Southwest Airlines plane made an emergency landing in Philadelphia after an engine exploded and a blew out a window in a deadly accident.

___

12 p.m.

A Southwest Airlines plane flying from Chicago to New Jersey has been forced to land in Cleveland after one of its windows cracked.

There were no reports of injuries after Flight 957 landed safely on Wednesday morning.

Dallas-based Southwest says that the plane diverted to Cleveland for a maintenance review after the issue on one of the multiple layers of window pane.

The emergency landing comes two weeks after a Southwest Airlines plane made an emergency landing in Philadelphia after an engine explosion and a blown out window.

A woman who was partly sucked out of that window was killed.