An anxious passenger is accused of stepping onto the wing of an Alaska Airlines jet at Seattle-Tacoma International Airport in the US.

Just after 5pm on Sunday night local time, a passenger described as anxious, used an unorthodox and likely illegal way off the aircraft.

Alaska Airlines flight 323 from Milwaukee had taxied to the gate and passengers were deplaning.

An anxious passenger is accused of stepping onto the wing of an Alaska Airlines jet at Seattle-Tacoma Intl. Airport. (AP)

Eyewitnesses say a female passenger opened an emergency exit door and climbed out onto the wing.

A Port of Seattle medic talked her down and she was taken to a local hospital.

Aviation Expert Scott Hamilton said she may or may not face criminal charges.

“If somebody is having an anxious episode or is having some kind of mental capacity issue and there’s clearly no intent of some kind, you just kind of go with the flow, so to speak and what would be the point of charging that person?” Hamilton said.

The FBI says it has been alerted but the US attorney’s office will determine whether the passenger will be charged.

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