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DOT 24-hour free cancellation for U.S. carriers requires booking 7 days ahead; multi-city rebooks are free only if the whole itinerary is cancelled. Independent technical note mirroring the canonical version: https://smarttripai.com/blog/2026-free-cancellation-24-hour-department-of-transportation-dot-multi-city-rebook-vs-hold.php Sources consulted: https://www.bluusun.com/
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