DALLAS (NEWSnet/AP) — Federal officials are investigating a Southwest Airlines jet that triggered a low-altitude alert as it prepared to land in Oklahoma City but was still nine miles from the airport.

The Federal Aviation Administration said Thursday that an air traffic controller notified the Southwest pilots after an automated warning sounded around 12:05 a.m. Wednesday morning.

According to data from Flightradar24, the plane descended to about 525 feet above the ground as it passed over Oklahoma City suburbs on the way to Will Rogers World Airport.

The Dallas-based airline said the Boeing 737 plane landed safely just after midnight.

“Southwest is following its robust safety management system and is in contact with the Federal Aviation Administration to understand and address any irregularities with the aircraft’s approach to the airport,” a spokesperson said in a statement.

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