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ATLANTA (WXIA) -- A Southwest Airlines flight headed to Denver from Atlanta was forced to turn back after a pressurization problem was noticed shortly after take-off Wednesday evening.

The captain noticed a warning light indicating a pressurization problem as the plane got to 8,000 feet leaving Atlanta's Hartsfield-Jackson International Airport.

The 127 passengers on board Southwest Flight 6225 were being transferred to another plane late Wednesday evening before heading on to Denver. The flight was also operating as AirTran Flight 1225. AirTran was purchased by Southwest in September 2010.

Southwest Airlines officials told 11Alive's Denver sister station KUSA that the first plane would be checked out before it would be returned to service.

No injuries were reported on the flight.

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