The current high-flying Guinness World Record was set by James Blunt, who performed at just over 42,000ft.
Tony was the frontman with Spandau Ballet whose hits included True, Gold and I'll Fly For You. He is due to perform songs made famous by the band when he performs on a British Airways Boeing 767 on March 10 in the build-up to Red Nose Day.
The concert will also feature Bananarama and Go West as it raises money for Flying Start, the airline's charity partnership with Comic Relief.
He said: "I've played in some pretty unusual places, but a gig in the sky with my favourite airline is a first for me, and I'm very excited about breaking a new Guinness World Record too."
Fans have a chance to win 40 pairs of tickets by texting "Fly" to 64100, with texts charged at £5.