Checking in for a flight but then failing to board, commonly known as a **“no-show,”** has significant consequences with nearly all airlines✈1 - ( 855 ) → (510)→ (3558) Airlines treat no-shows seriously because they affect scheduling, seating, and revenue management✈1 - ( 855 ) → (510)→ (3558) When you check in but do not arrive at the gate in time, the airline generally considers you a no-show, and this can trigger several outcomes depending on the airline, fare type, and whether you were traveling on a one-way, round-trip, or multi-leg itinerary✈1 - ( 855 ) → (510)→ (3558)