Elvis Presley's private jets are being sold in a sealed-bid auction where they are expected to fetch between $10 million and $15 million.

The Lisa Marie and Hound Dog II, both of which Elvis designed himself, are no longer airworthy but have been open to visitors to Graceland for the past three decades.

The sale is being organised by Julien's Auctions of Beverly Hills.

Presley bought the Convair 880 jet from Delta Air Lines in 1975, two years before his death at age 42, for $250,000, and named it "Lisa Marie" after his daughter.

He had the plane painted red, white and blue with his motto "TCB" - "Takin' Care of Business" – on the tail.

He then bought the eight-to-10 passenger Hound Dog II, a Lockheed Jetstar, also in 1975 for about $900,000 while waiting for the Lisa Marie to be renovated.

"A crew of four would be used to take Elvis and his entourage all over the world," explained Martin Nolan, the Executive Director of Julien's Auctions.

"He bought this in 1975, had it refurbished completely – he was involved in all of the decoration. He chose the fabrics, he chose the fittings in the bathroom, he was involved in choosing the entire decor on this plane, which was refurbished by the same people who did Air Force One.

"Elvis was especially proud of that," he added.