June 20 (Reuters) - The Federal Aviation Administration

(FAA) said on Thursday it is investigating a Southwest Airlines ( LUV )

flight that descended to a low altitude 9 miles (14.5

km) from the Oklahoma City airport.

The FAA said the incident involving Southwest Airlines

Flight 4069 occurred around at 12:05 a.m. Wednesday. After the

automated Minimum Safe Altitude Warning sounded, an air traffic

controller alerted the crew.

There have been several incidents involving Southwest ( LUV )

flights in recent months that have raised concerns.