An inspection of 181 Boeing 737s, following a US plane's emergency landing due to a discovery of a football-sized hole in the plane's fuselage, has revealed no problem.

Earlier, a probe was launched by the National Transportation Safety Board into the occurrence of hole in the fuselage of Flight 2294.

The jet lost cabin pressure just after 30 minutes of takeoff from Nashville.

Flight 2294, which had 126 passengers and 5 crew aboard had departed for Baltimore but had to land in Charleston, West Virginia after some passengers discovered the hole.

After the occurrence of the incident, structural experts were rushed to Charleston to investigate the jet.

Tom Brantley, national president of the Professional Aviation Safety Specialists, said, "It was a serious infraction - the average person would have a hard time believing its O. K. to have a crack anytime in an airplane."

Out of Southwest's 500 737s, the Boeing Co 737-300s accounts for a 33 percent planes.

It is worth mentioning here that earlier in March Southwest Airlines was asked to pay a $7.5 million fine for violating safety norms.

Approximately one thousand 737-300s are operating all over the world.