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In case you did not cancel or reschedule your United Airline flights before departure then you will be considered a 'No Show' by the airline. Being marked as a United Airlines no-show can lead to the automatic cancellation of subsequent flight segments especially on round-trip or multi-city tickets. Although United might allow rebooking but it will involve change of fees or fare difference. However, in some cases, frequent flyers with elite status may receive more flexibility. So always check United's policy before missing a flight to minimize your losses.