خانة المطار (Airport Slot)

What Is an Airport Slot?

An airport slot is a permission granted to an airline to use the full infrastructure of an airport — runway, taxiways, gates, and stands — for a landing or departure at a specific time on a specific date. At Level 3 (fully coordinated) airports, where demand for runway access consistently exceeds capacity, slots are the primary mechanism for managing traffic flow and ensuring that airlines receive a fair and transparent allocation of scarce capacity. Without a valid slot, an airline cannot legally operate a scheduled service at a coordinated airport, regardless of whether it holds the necessary route rights.

How It Works

Slot allocation at Level 3 airports follows the IATA Worldwide Scheduling Guidelines (WSG). A neutral slot coordinator — an independent body, not the airport authority — allocates slots twice yearly (for the summer and winter scheduling seasons) based on historical precedent ("grandfather rights"), new entrant carve-outs, and clearance of waitlists. Airlines that held a slot in the equivalent season of the previous year retain the right to the same slot the following year — provided they use it at least 80% of the time (the "use it or lose it" rule). Slots not used at the 80% threshold return to a pool for reallocation.

Types and Standards

• Level 1: Airport capacity adequate for demand; no formal coordination required.
• Level 2 (schedule facilitated): Some capacity constraint; voluntary coordination with a facilitator.
• Level 3 (fully coordinated): Demand significantly exceeds capacity; mandatory slot allocation. Examples: Heathrow, Frankfurt, Tokyo Haneda, Sydney.
• Historic slot: A slot held for at least two equivalent seasons; confers grandfather rights — the most valuable form of slot tenure.

Interesting Facts

• Heathrow slots have been bought and sold between airlines for hundreds of millions of dollars — a pair of Heathrow slots was reportedly sold for $75 million in 2016.
• During COVID-19, regulators temporarily waived the 80/20 use-it-or-lose-it rule to prevent airlines flying empty "ghost flights" simply to retain their slots.
• New entrant carriers seeking Heathrow slots often wait years on the waitlist — barriers to entry at slot-constrained airports significantly limit airline competition.
• Some Asian airports (Beijing Daxing, Dubai) were specifically designed with massive capacity to avoid the slot constraints that restrict growth at legacy hubs.