Germany's busy airspace was cleared for commercial flights on Wednesday, bringing most of Europe back to normal operations following a crippling, six-day closure across much of Europe. Regulators estimated 21,000 flights would cross European airspace today, compared to 28,000 on a normal day. Still, airlines said it would take weeks to work through the backlog of stranded travelers and return to normal operations after a crisis that cost the industry an estimated $1.7 billion. Analysts predicted U.S. airlines would suffer about $100 million in losses.

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