A No-Show is a Passenger who has a Reservation on a specific flight, but does not show up for that flight.
Other definition:
No-Show is a traveller who does not appear for a flight on which he or she has a reservation and fails to cancel that reservation properly. Airlines will cancel all further flights on a traveller's itinerary if a reservation is not cancelled.
Other definition:
No show is a passenger who doesn't show for a flight, hotel, or rental car Booking - shame on you for not canceling !!
Other definition:
No show is a Passenger or Hotel guest who fails to cancel a Reservation not used
Other definition:
No-Show is a traveller who does not appear for a flight on which he or she has a reservation and fails to cancel that reservation properly. Airlines will cancel all further flights on a traveller's itinerary if a reservation is not cancelled.