Canadian officials have detained a young Asian man who apparently boarded a flight from Hong Kong to Vancouver disguised as an elderly white male.
Canadian Border Services said the man wore a silicone mask covering his head and neck in what they called an "unbelievable case of concealment".
Suspicions were raised when an apparently elderly passenger was noticed with young-looking hands.
Later he emerged from a washroom looking like a man in his twenties.
An internal intelligence alert from the Canadian Border Services Agency (CBSA) showed before-and-after photos.
The passenger was seen at the start of the flight as an "elderly Caucasian male who appeared to have young-looking hands," the CBSA bulletin said.
"The subject attended the washroom and emerged an Asian looking male that appeared to be in his early twenties."
The document said the man had a bag with a "disguise kit which consisted of a silicone type head and neck mask of an elderly Caucasian male, a brown leather cap, glasses and a thin brown cardigan."
"We can confirm that officials from the CBSA met a passenger arriving off AC018 Hong Kong to Vancouver on October 29 and the matter is still under investigation," Air Canada spokesperson Angela Mah told the AFP news agency.
The man is reported to be seeking refugee status in Canada.