Events that may exempt an airline from fixed compensation under a particular rule if the legal test is met. They do not automatically erase every other duty.
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Why it matters
Ask the airline what happened and what reasonable measures it took. The label alone doesn’t settle an exemption.
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Where to go next
Compare the applicable rule with your ticket and the airline’s written notice. You can also browse other flight-claim terms.
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This definition is a starting point. The rule and ticket terms for your flight still matter.