Two private airplanes that once belonged to legendary rock star Elvis Presley are now on sale and could disappear by 2015 from the late singer's Graceland mansion, where they have been on display for the last 30 years.

Both planes appeared this week on the aircraft sales website Controller with their descriptions and specifications.

The Lisa Marie, a 1960 Convair 880 named after Elvis's only daughter, is a four-engine airplane with a private bedroom, a stereo system and a bathroom with gold fittings.

Hound Dog II, a JetStar, was used as a substitute aircraft while the Lisa Marie was being remodelled to suit the likings of the King.

The airplanes' owner, K.G. Coker, who acquired them in 1977 after Presley's death, said "they are museum pieces" and expresses a willingness to hear any serious offers, though he has avoided setting a price.

Up to now, the planes have been two of the most visited items at the Elvis Presley mansion in Memphis.

The last time the Lisa Marie flew was in 1977 on a trip from Los Angeles to the funeral of Elvis Presley, with his ex-wife Priscilla Presley and former Beatle George Harrison on board.