 Due to massive delays in the L-1011 program, mainly due to problems with the Rolls-Royce RB211 engines, Eastern leased two Boeing 747-100s from Pan Am between 1970 and 1972 and operated the aircraft between Chicago and San Juan as well as from New York to Miami and San Juan.Just before Walt Disney World opened in 1971, Eastern became its "official airline".It remained the official airline of Walt Disney World and sponsored a ride at the Magic Kingdom park (If You Had Wings in Tomorrowland where Buzz Lightyear's Space Ranger Spin is currently located) until its contracting route network forced Disney to switch to Delta shortly before Eastern's 1989 bankruptcy filing.