A ground crew member walks near Alaska Airlines planes parked at Seattle-Tacoma International Airport in SeaTac, Washington, Oct. 30, 2013.
The overnight Boeing 737 flight from Anchorage to Seattle was rerouted on Wednesday with 178 passengers on board after one of the travellers locked himself in a bathroom and took his clothes off.
It wasn't immediately clear if the man was arrested.
Alaska Airlines Flight 146 returned to Ted Stevens Anchorage International Airport around 3 a.m. Wednesday, about an hour and a half after takeoff, airport police told KTVA.
Kate Danyluk, a passenger on Alaska Airlines flight 146, told The Associated Press that the passengers could easily sense something was wrong as the flight attendants were moving back and forth wearing rubber gloves.
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"While no emergency was declared, the decision was made to return to Anchorage".
Danyluk, an Anchorage teacher, was going to Seattle to attend a garden show. Though Danyluk didn't catch a glimpse of the man, she'd heard that "he had taken off his clothes and he just wasn't in his right mind".
Once the plane landed back in the Last Frontier State, the Boeing 737 was greeted by airport police and Federal Bureau of Investigation agents, who quickly removed the man from the plane.
She added: "I'd rather go back to Anchorage than have something happen, safety first". It was also reported this week that an Alaska Airlines pilot will plead guilty on charges of flying drunk.
Federal Bureau of Investigation agents responded to the airport and questioned the man as well as passengers who had been onboard the diverted flight, but a spokesman for the U.S. attorney for Alaska said no charges had been filed as of Wednesday afternoon.
She said that she and most other passengers did not see the man being taken off the flight, because several other men were standing near the bathroom to shield the view.