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The generic "2 hours domestic, 3 hours international" rule ignores that not every airport is the same — LAX and Heathrow genuinely need more buffer for security, while Singapore Changi and Tokyo Haneda are fast enough that you can safely cut it closer.
Pick your airport and flight type above to see a recommendation based on that airport's actual security and check-in congestion, not a one-size-fits-all number.