Passengers get very confused after missing the flights. Usually, airlines will not allow any refund or compensation if you have missed the flight, but some of them offer a refund in travel credit if you are flying with higher fare options. Airlines request that passengers visit the airport counter or call the customer service immediately after they miss the flight. The representative will help the passengers; you may have to pay the full ticket value for booking. They can help you in rebooking. Read the missed flight policy of different airlines.
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