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You can miss your flight due to various reasons, such as being stuck in traffic, medical emergencies, cancellation, and delays for more than 3 hours. But don't stress! You can rebook for the next available flights online by visiting the official website, calling customer service, or going to the airport. You can join a standby list or make a same-day flight change on the same day of a scheduled departure.

See more : How to Handle a Missed Flight with United Airlines