As a child in 1967, I just happened to be in Melbourne, Australia when Pres Johnson arrived on a much-televised flying visit. His plane was a beautiful Boeing 707. VC-137C SAM 26000 — Wikipedia

Wiki: “One of the most unusual international trips in presidential history occurred before Christmas in 1967. The president began the trip by going to the memorial service for Australian Prime Minister Harold Holt, who had disappeared in a swimming accident and was presumed drowned. The White House did not reveal in advance to the press that the president would make the first round-the-world presidential trip. The trip was 26,959 miles completed in 112.5 hours (4.7 days). The trip crossed the equator twice, stopped in Travis Air Force Base, California, then Honolulu, Pago Pago, Canberra, Melbourne, Vietnam, Karachi and Rome.” [List of international trips made by presidents of the United States — Wikipedia ]

(Prince Charles flew in to attend the same event and his plane was an (arguably) even more beautiful Vickers VC10.)