British Airways, Virgin Atlantic, Qatar Airways, American Airlines, Emirates, Delta, Etihad Airlines, Finnar, Flybe, Iberia, Air France, Beijing Capital Airlines.

As the UK's busiest airport, London Heathrow (LHR) is used by over 80 major international airlines in 2026. British Airways is the primary occupant, controlling over 50% of the slots and operating largely out of Terminal 5. Other major users include Virgin Atlantic (Terminal 3) and the full spectrum of "High-Fidelity" global alliances. Star Alliance carriers (like United, Lufthansa, Air Canada, and Singapore Airlines) primarily use Terminal 2, while SkyTeam members (such as Delta, Air France, and KLM) and oneworld partners (like American Airlines, Qatar Airways, and Qantas) are spread across Terminals 3 and 4. In 2026, Heathrow has also seen the arrival of new operators like IndiGo (flying from Delhi and Mumbai) and the return of Pakistan International Airlines. From ultra-luxury "High-Fidelity" carriers like Emirates and Etihad to major national airlines from every continent, Heathrow serves as the ultimate high-fidelity global hub, connecting London to over 200 destinations and maintaining its status as a high-fidelity requirement for any airline seeking a premium presence in the European market.