Why Do Planes Circle Before Landing?
Sources: FAA AIM, EUROCONTROL, ICAO Doc 4444 · Updated May 2026
Aircraft circle in standardized racetrack-shaped holding patterns to absorb arrival delays. The common reasons: traffic congestion (more arrivals queued than the runway can accept), weather at the destination (thunderstorms over the airport, low visibility, strong winds), runway temporarily unavailable (occupied, closed for inspection, snow clearance), or sequencing during peak hours. Holding is a planned, normal procedure — every commercial flight carries reserve fuel for an expected holding period. Holds are flown at published holding fixes, in racetrack-shaped tracks, with multiple aircraft stacked at 1,000 ft vertical separation. The aircraft at the bottom of the stack is sequenced to land first.
Five common reasons a flight holds
Major hubs run close to their runway capacity at peak hours. If a few flights arrive bunched together, ATC sequences them by adding a hold to stretch the queue. Common at London Heathrow (Lambourne, Bovingdon, Biggin, Ockham stacks), New York JFK, and Tokyo Haneda.
Thunderstorms moving over the airport, low visibility below approach minima, or strong gusty crosswind on the active runway all trigger holds. The crew either holds for the weather to clear or eventually diverts to an alternate.
A disabled aircraft on the runway, a runway inspection, snow clearing, or a brief closure for an emergency aircraft means arrivals queue up. Once the runway reopens, the queue is sequenced from the bottom of the holding stack down.
EUROCONTROL Network Manager and the FAA Air Traffic Control System Command Center issue flow restrictions to manage congestion across multiple airports and en-route sectors. Some of that flow control becomes airborne holding when ground-delay strategies are not enough.
An ILS that needs a brief recalibration, an arriving aircraft with a minor malfunction working a checklist before approach, or a runway-change procedure — any of these can put the queue into a brief hold.
What a holding pattern looks like
The standard holding pattern is a racetrack shape: two parallel straight legs (typically 1 minute each at altitudes below 14,000 ft, or 1.5 minutes above) connected by two 180-degree turns. The pattern is flown at a published holding fix — a named navigation point with a defined direction (inbound radial), turn direction (right-hand standard, left-hand non-standard), and altitude.
Multiple aircraft can hold at the same fix, stacked vertically with at least 1,000 ft separation (300 m). New arrivals join at the top; aircraft at the bottom are sequenced to land first. As the bottom aircraft leaves, everyone above descends one level. The result is an orderly conveyor belt of arrivals.
Expected Approach Time (EAT)
When ATC issues holding instructions, the controller usually provides an Expected Approach Time — the time at which the aircraft will be cleared to leave the hold and begin an approach. The crew uses this to plan fuel and to make hold-versus-divert decisions. If the EAT keeps slipping or the destination weather worsens, the crew will exit the hold and divert to an alternate airport with enough fuel for a comfortable approach there.
Fuel planning — holding is planned for
Every commercial flight is dispatched with reserve fuel categories specifically designed for situations like holding:
- →Final Reserve Fuel: 30 minutes of holding at 1,500 ft above destination (jet) — never used; the legal minimum landed with.
- →Alternate Fuel: enough to fly from destination to the planned alternate airport.
- →Contingency Fuel: 5% of trip fuel (or other regulator-set value) for unforeseen events.
- →Extra / Tankering Fuel: discretionary fuel added by the captain based on forecast conditions.
So when you see your aircraft hold for 15 or 20 minutes, that fuel was already on board before pushback.
Famous holding stacks
Should I be worried if my flight is holding?
No. Holding is a normal, planned, routine procedure. You may notice the aircraft banking gently every few minutes — that is the racetrack pattern. The crew is in communication with ATC, the fuel state is monitored constantly, and the captain has full authority to leave the hold and divert if the situation does not improve. Diversions are inconvenient but they are operationally safe.
Sources
- FAA Aeronautical Information Manual (AIM), Chapter 5 Section 3 — Holding
- ICAO Doc 4444 — Procedures for Air Navigation Services: Air Traffic Management
- EUROCONTROL Air Traffic Management Procedures and Guidelines
- FAA JO 7110.65 — Air Traffic Control Order, Chapter 4 Section 6 (Holding)
- ICAO Annex 11 — Air Traffic Services