Authorities probe markings on Southwest airliners

Federal officials have joined the investigation into a rash of tagging incidents involving Southwest Airlines passenger jets.

According to an internal memo obtained by ABC15 in Phoenix, "These unauthorized markings typically appear as symbols or words tagged on the exterior of the aircraft."

A Southwest Airlines spokesperson confirmed to the station that markings are being written on the underbelly of 737s parked at the gate.  KTLA

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