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NEW YORK — Advance planning by Lufthansa, one of Europe’s busiest airlines, seemed to be paying off Wednesday at the beginning of a three-day strike by pilots, despite the cancellation of about 900 flights worldwide.
But some travelers were nonetheless left scrambling to find alternative flights. And the city of Frankfurt, a major Lufthansa hub, was bracing for possible trouble in the coming days, as thousands of attendees of a big lighting industry trade show wondered whether they would be able to find ways out of the city on Thursday and Friday.