Terminal 4
- American Airlines.
- British Airways.
- Condor Airlines.
- Lynx Air.
- Southwest Airlines.
- Volaris.
- WestJet.
With more than 20 gates, Terminal 3 serves passengers for Delta Airlines, Frontier Airlines, Northwest/KLM, Sun Country Airlines, American Airlines, JetBlue Airways, and Midwest Airlines. Terminal 4 is the airport's largest terminal.
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Terminals 4, 5, and 6 use underground tunnels, and 6, 7, and 8 are connected via above-ground tunnels. International Terminal B is linked to Terminal 4 with an above-ground connector tunnel that has moving walkways. It takes around 5 to 8 minutes to walk between each terminal.
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Shuttle trains are available on the Elizabeth Line and Hearthrow Express between Heathrow Terminal 4 and Terminal 5, please change trains at Heathrows Terminals 2&3.
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The terminals are arranged in a circular format that is referred to as The Terminal Loop. Terminals 1, 2, and 3 serve primarily domestic flights, while the International Terminal serves (you guessed it!)
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T! for Domestic flights and T3 is for international flights. As some of the domestic flight depart from T3 but non of the international flight depart from T1.
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