Two of Elvis Presley's private jets are up for auction after spending three decades on display at his Graceland estate in Memphis, Tennessee. Neither the vintage Convair 880, dubbed the Lisa Marie after Presley's daughter, or smaller Lockheed JetStar, known as Hound Dog II, are deemed airworthy. But for devout fans of the King of Rock 'n' Roll, who would have been 80 this Thursday, the two aircraft have afforded a unique glimpse into his jet-setting lifestyle. Los Angeles auction house Julien's, in a statement, anticipated sealed bids to come from collectors, aviation enthusiasts and entrepreneurs who might put the planes on show elsewhere.