Qantas passenger's extraordinary reaction as his first-ever flight in business class is ruined when he's suddenly booted back to economy for a strange reason

An Aussie sales executive has been praised for his calm reaction to being booted from business class to economy in the first moments of a 10-hour flight.

Jameel Rehman, from Melbourne, scored a business class flight for two from Sydney to Honolulu as a work bonus but had to move after engineers found a fault in his seat. 

Mr Rehman recorded his reaction after receiving the news and said that staff were very apologetic but did not waste any time getting him into economy. 

His mum, who was his plus-one, retained her seat and happily waved toward the camera as her son polished off his glass of Champagne before humbly departing. 

'How the mighty have fallen,' Mr Rehman declared as he entered his new cabin to the sound of a baby screaming.