American Airlines has long been the largest U.S. carrier at London Heathrow Airport. It has the greatest number of slots for any non-UK airline, and the airport is its primary European hub as it coordinates schedules with British Airways, the largest airline at Heathrow, as both airlines are founding members of the oneworld alliance .

However, this is all changing, as American Airlines has canceled flight services from three different U.S. cities to London for its Summer 2026 schedule. The airline will now fly nearly 20% fewer flights to London than it did just two years ago. But why the abrupt change? The answer is in part due to its partnerships, but surprisingly, also because of the international expansion of another U.S. airline: Alaska Airlines. Here's how Alaska Airlines' new vent

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