A plane passenger was disgusted when a man rested his stinky feet on her armrest during a flight.

Pornpreeya Keng, 27, boarded a low-cost Vietnam Airlines flight from Bangkok's Suvarnabhumi International Airport for a trip to Ho Chi Minh City in Vietnam on September 2.

But as she settled in her seat to enjoy the view out of the window, an offensive odour suddenly irritated her nose. When she looked down, she saw the source of the repulsive smell - a man's bare foot was poking through the gap and propped up on her armrest.

Footage from onboard the Airbus A320 shows a visibly disturbed Keng recording the sticky scene while sitting next to the guy's hot sweaty feet.

Keng said the inconsiderate passenger kept moving around to find a better sleeping position, causing the smell to intensify and make her dizzy.

She said: 'I tried to shift in my seat to make him aware of my discomfort, but he didn't notice me. I felt uncomfortable, but I did not want to confront him directly, so I took a video of his poor manners.

'His feet were smelly and dirty. I felt it was unhygienic to have them on the armrest, so I disinfected it afterwards with an alcohol wipe.'

Keng later called the attention of an air hostess, who instructed the man to take off his feet on her behalf.

Keng then disinfected her armrest with some wet wipes and used a menthol nasal inhaler to clear her sinuses of the stomach-turning feet odour.

She added: 'Everyone should educate themselves on proper flight etiquette. If anyone experiences what I did, inform the flight attendant and ask for help.'

Plane passengers in the early days of aviation would never have experienced such a problem. Many airlines had strict dress codes.

In the 1950s, Pan American World Airways, known as Pan Am, ordered male passengers to wear suits and ties, while women were expected to wear skirts and blouses. Shorts, jeans, and T-shirts were not considered appropriate attire for a plane. Hair was also required to be neat and tidy.

Dress codes gradually began to loosen - much to the detriment of commercial aviation - and in the 21st century it is not unusual to find backpackers in shorts, vests and barefooted on planes - even putting their feet on the seats.