'No-show' policies mean that if someone does not travel on their outbound flight, then all other connecting or return flights associated with the booking will be automatically cancelled. New tickets will need to be purchased for returning or connecting flights, if travel on these flights is still intended.

When a passenger fails to show up for a flight—often referred to as a "no-show"—several automatic consequences occur within the airline's computer system. First, for security reasons, if that passenger had checked luggage, the airline is legally required to remove those bags from the aircraft before takeoff to ensure that no unaccompanied baggage is on board. Second, the airline will typically cancel the remaining segments of that passenger's entire itinerary, including any connecting flights and the return journey, unless the traveler contacts the airline immediately to explain the situation. From a financial perspective, most "Basic Economy" or non-refundable tickets are forfeited entirely, meaning the passenger loses the value of the fare. However, if the "no-show" was due to an emergency, some airlines may apply a "flat tire rule" or offer a partial credit toward a future flight, though this is purely at the agent's discretion. The empty seat is often filled by a standby passenger or a crew member traveling for work, ensuring the airline maximizes its load factor even when someone misses their gate.