By day
Movements per day
Arrivals and departures combined, counted as the airport listed them, so a flight later cancelled is still one of them. The hourly chart counts only those that moved and so runs a little lower on the same day.
On-time rate
Share arriving or departing no more than 15 minutes after schedule — early counts as on time, as the industry measures it. Cancellations are excluded: a flight that did not operate has no actual time and so no delay.
By hour of day
Movements by hour
Zurich local time
Median delay by hour
Minutes against schedule, by timetabled hour — always, even when the chart beside it is on actual time. Bucketing delay by actual time is circular: a flight lands late in the evening because it was late.
Airlines, destinations and aircraft
Busiest airlines
Movements across the whole archive
On-time rate by airline
Across the whole archive. Carriers with at least 20 movements, so a percentage rests on enough flights to mean something. On time is no more than 15 minutes after schedule, the same rule as the chart by day.
Busiest cities
Origins and destinations combined, across the whole archive
Aircraft types
Movements by model across the whole archive. Arrivals and departures are near-identical for every type — an aircraft that lands here also leaves — so the total is the figure that carries information; the split is on hover.