Flying some of the cold war's hottest routes, Pan American World Airways meets political turbulence as often as the natural kind. Pan Am hardly inaugurated its new thrice-weekly New York-Berlin service before Moscow thundered that the nine-hour jet flights violated four-power agreements on Berlin and warned darkly that it could not be responsible for any dire consequences. Predictably, the airline kept right on flying last week, and the Communists did nothing.
Although the Russians have long harassed Pan Am's flights from eight West German cities through the 110-mile air corridor to Berlin, its Berlin run has...