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DOT's 3-hour tarmac rule lets passengers deplane, not get cash; refunds may apply for 3+ hour domestic or 6+ hour international delays, plus EU261 up to €600. Independent technical note mirroring the canonical version: https://aiflightrefunds.com/blog/flight-delay-refund-2026-department-of-transportation-3-hour-tarmac-rulerefund-or-not.php
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