Investigators have ruled out terrorism, but so far, not the cause of the rupture could produce.
The hole caused a sudden drop in cabin pressure and flight 812 from Phoenix, Sacramento was forced, make a steep descent and landing.
A flight attendant was slightly injured during the incident on Friday.
Eyewitnesses reported a few people on board the Boeing 737-300 almost passed out while scrambling for oxygen masks.
There were 118 passengers and crew on board the 15-year-old plane.
"Heaven to see you"An FBI spokesman said terrorism was not suspected, and "it seems to be a mechanical problem".
Passenger Brenda Reese said that the aircraft had left only Phoenix, when they heard a "shot-like sound".
"It at the top of the level, right above above you luggage store," said they the associated press by phone from the plane.
"The Panel is not fully out." It is like crack down... "If you look at the Panel, you can see the sky."
Passengers said they were glad to be aliveShe said that "pretty quickly had cleared aircraft".
Another woman on Board said: "she had just drink I heard a huge sound orders when worn and oxygen masks came."
"There was a hole in the hull about three metres long." She could see the insulation and cabling. "Could a tear the length to see one of the Deckenpanelen."
Aviation officials said the pilot made controlled descent, dropping 8,000 m (25000ft) of 11,000 metres in about five minutes.
The National Transportation Safety Board, said one "in-flight hull rupture" led to the sudden descent and fall in cabin pressure.
"We know not the cause of the decompression," Federal Aviation Administration spokesman Ian Gregor said.
The same happened to an other Southwest Jet in 2009. Metal fatigue was the cause.
in 1988 cracks, caused open Aloha Airlines of Hawaii a hole in a plane. A flight attendant died in this incident.
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