A few days ago, Delta Airlines chartered a plane from London to the United States loaded with 1,000 suitcases that had been stranded in London. This partly reflects the chaos—with flight delays and cancellations, that are affecting European airports. So, if you’re planning to travel to Europe, it wouldn’t hurt to plan your itinerary carefully. Here’s the ranking of the worst and best airports, according to Hopper.com.

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