With in-flight movies, martini lunches, champagne dinners and hostesses waking people up to offer eyeshades that might help them sleep more soundly, some passengers feel long-distance air travel is already sybaritic enough. The airlines, however, disagree; already they are turning their minds toward tomorrow's jumbo jets. And in their visions there are many-splendored pleasure domes that even an oil sheik could envy. "Imagine an airliner with a penthousewith staterooms or offices," glowed two-page American Airlines ads showing interior sketches for its Boeing 747 models last week. "There will be a spiral...
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