Kanye West surprised passengers on a US flight by giving them an impromptu concert.

The 'Runaway' singer reportedly took to the in-flight loudspeaker in the cockpit of the Delta Airlines flight from Minneapolis to New York, where he rapped versions of his hits 'The Good Life' and 'Gold Digger.'

The famously outspoken rapper reportedly serenaded passengers 30 minutes into the flight, giving edited versions of his tracks, omitting profane language.

A passenger on the flight told website HollywoodLife.com: "I had to pass through First Class to get my seat in Economy, and I saw Kanye sitting there with a little drink in his hand.

"I wouldn't have even thought it was him, but he was sitting with a very PR-looking lady."

Describing how the star then got up to perform for those on board, the witness continued: "He was like, 'Yo, this your n***a, Kanye.

"Then he couldn't decide if he wanted to do 'The Good Life' or 'Gold Digger,' so he was like, 'I'll just do a little bit of both.' It was awesome - but I still have no idea how he got into the cockpit."

The witness said what shocked them most, however, was that Kanye didn't demand preferential treatment upon leaving the plane.

The source added: "He filed out in line with everyone else, and I thought that was pretty cool. Especially for Kanye."

Kanye also posted a message of support to his fans over the weekend, tweeting: "All my fans have really supported me through the dark times and I wanna thank yall for the constant motivation.

"Even when I'm super tired I don't wanna let yall down... my fans are my family ... FANMILY! (sic)"

Kanye releases his new album 'My Beautiful Dark Twisted Fantasy' on November 22.