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Heathrow Tops OAG’s 2025 Megahubs as Istanbul and Amsterdam Surge

The 10th edition measures connectivity by counting all possible same‑day transfers within six hours on each airport’s busiest day.

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Overview

  • London Heathrow retains No. 1 for a third year with about 59,000 possible connections to 226 destinations.
  • Istanbul leaps to No. 2 and Amsterdam to No. 3, while Frankfurt jumps to a tie at No. 4 with Kuala Lumpur; Tokyo Haneda slides to No. 9.
  • Chicago O’Hare rises to No. 7 on 17% growth and 15 added destinations, reclaiming the top spot on OAG’s U.S. domestic list.
  • Atlanta re-enters the global Top 10 at No. 8 after a 14% increase in potential connections and eight new destinations.
  • Kuala Lumpur ranks joint No. 4 globally and remains the world’s leading LCC megahub as Asia Pacific supplies 16 of the Top 25 LCC hubs, with AirAsia operating 36% of flights at KUL.