The pilot of Alaska Airlines flight 448 reported hearing banging from beneath the aircraft after takeoff from Seattle-Tacoma International Airport, south of Seattle, the statement said.
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Screaming could also be heard from the cargo hold, an airport spokesman said.
When the aircraft returned safely after being in the air for 14 minutes, a ramp agent was found inside the pressurized and temperature-controlled front cargo hold, the statement said.
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After exiting, the Menzies Aviation employee told authorities he had fallen asleep, Alaska Airlines said in a statement.
"The ramp agent appeared OK, and was transported to the hospital as a precaution," the airline said on its website. "We are actively investigating the matter."
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