Almost 400 airports worldwide have long-haul scheduled passenger flights in September . Due to its renowned slot shortage and huge demand, including from premium passengers, London Heathrow remains number one. It has an average of 251 daily long-haul departures , up by four compared to last September. More long-haul carriers are coming .

In this article, 'long-haul' is taken to mean any flights that cover at least 3,000 statute miles (2,607 nautical miles, 4,828 km) each way. This is the same cutoff point that United Airlines uses . Marginal changes to this distance would have little impact on the results. All data is from Cirium Diio.

The World's Top 10 Airports For Long-Haul Flights In September

Schedule analysis shows that 37% of London Heathrow's total departure

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