The world's busiest airports often dominate aviation statistics, but many of the biggest bottlenecks in commercial aviation are found not on the ground but in the air. Every day, hundreds of thousands of passengers pass through a handful of critical air corridors where dozens of airlines, multiple air traffic control authorities, and flights from every continent converge. When everything runs smoothly, these invisible highways keep global aviation moving. When they do not, delays can quickly spread across continents.
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