You're Right! It's the beginning of the 70s, but already there is such a mood of change in the air that one small revolution can mask another. First, the arrival of the Boeing 747 "Jumbo" amid great publicity. 747 commercial service begun by Pan Am on New York-London route. With the ability to carry more than 400 passengers more than 5,500 miles, the 747 opened up economic long-distance travel to the masses. Its size also caused problems for airports that had to make significant modifications to handle the 747. Pan Am, who made the first purchase in 1966, had the honor of taking delivery and flying the first commercial 747, dubbed Clipper Young America. Sadly, this plane was fated to be in the worst aviation accident of all time. But it was all smiles on January 21, 1970 when the 747 took off from New York's John F. Kennedy Airport and landed later that day in London. It is a machine with many fine qualities: it is beautiful to look at; it is powerful; it is comfortable, and it has a certain charm. In short, those who work on board it should have nothing to complain about. Most of the great airlines - Pan Am, Air France, British Airways and Sabena - have accordingly wanted to change the appearance of their hostesses. The length of skirts and dresses is to be shortened to reveal more leg than before - especially on the other side of the Atlantic. Pan Am, for instance, prefers its hostesses to wear mini-skirts, while Belgian Sabena favors more modest hemlines that come to just above the knee.