Guide

Where is my plane coming from?

Before your flight can leave, the plane that will operate it usually has to arrive from somewhere else. Knowing where that plane is right now is one of the earliest signs of whether you will leave on time.

Why the incoming plane matters

Airlines don't keep a plane waiting at the gate for each flight. The same aircraft flies several trips a day, one after another. The plane you board this evening may have flown two or three other routes since the morning.

That chain is why delays spread. If the plane's earlier flight leaves late, or lands late because of weather or a busy airport, there is less time to get it ready for you. When it lands too close to your departure time, your flight is very likely to leave late too, even if the departures board still says on time.

There are ways an airline can recover. Some turnarounds have spare time built in, and sometimes the airline moves your flight to a different plane that is already on the ground. But in most cases, a plane that is running late on its way in is the clearest early warning you can get.

How to find the incoming flight yourself

You can do this by hand with a flight tracking website or app. It takes a few steps:

1. Find the plane's registration. Every aircraft has a registration, often called the tail number, such as G-EZAB or D-AIZB. Flight trackers usually show it for your flight once the airline has assigned a plane, which is often only close to departure.
2. Look up that registration's flights today. Trackers list each leg the aircraft has flown or is due to fly.
3. Find the leg that lands at your airport before your departure. That is your inbound flight. Note when it is expected to land.
4. Allow time on the ground. After landing, the plane has to taxi in, let passengers off, be cleaned, refuelled and loaded, and board the next group. This is called the turnaround. It can be around half an hour for a small jet on a short route and much longer for a large aircraft.
5. Compare. If the expected landing time plus the turnaround is later than your departure time, expect a delay.

A useful pattern: many airlines give an out-and-back trip consecutive flight numbers, so the return of flight 5131 is often 5132. If the registration isn't shown yet, the flight with the neighbouring number arriving at your airport is often your plane. It isn't a rule, so treat it as a clue.

How airlines show it

Some airline apps show where your aircraft is coming from or whether it has arrived. Many don't, and an airport departures board never does: it only shows the airline's own status for that one airport.

Airlines usually change a flight's status once they know the new departure time. Until then, a flight whose plane is still hundreds of kilometres away can keep showing as on time. That gap is where checking the incoming plane helps.

Keep in mind that the aircraft assignment can change until shortly before departure. If the airline swaps planes, the one you were watching may no longer be yours.

How DelayAhead does it for you

DelayAhead automates the steps above. Enter your flight number and date, and it:

• works out which plane is operating the flight, where it can;
• finds that plane's earlier flight into your departure airport and when it is expected to land, or when it landed;
• adds the time the plane usually needs on the ground on that route, based on recent turnarounds where they are available;
• tells you if it can't be ready in time, with the likely delay and the new expected departure and landing times in local time at each airport.

The result also says how sure we are about the plane: seen live, assigned by the airline, matched to this flight by its paired flight number, or our best guess. If we can't identify the plane yet, we say so and show what the airline reports instead. We never show a flight as on time just because we don't know.

If you want to keep an eye on it, you can get free alerts by email or on Telegram. We message you when the airline's departure or arrival time changes, and stay quiet otherwise.

What the incoming plane can't tell you

The inbound flight is a strong signal, but not the only cause of delays. Air traffic control restrictions, weather at your airport, crew availability and technical checks can all delay a flight whose plane arrived on time. An airline may also swap in another aircraft and leave on time after all. Treat our result as an early estimate and always check with your airline before you travel.