"National security site" is not a synonym for "military installation." It means "critical infrastructure whose failure causes significant adverse effects." Th

"National security site" is not a synonym for "military installation." It means "critical infrastructure whose failure causes significant adverse effects." The UK's main airport is absolutely that. Your quote about 99% of air cargo not coming through Heathrow is made-up nonsense. The correct figure is closer to around 50% by volume and 70% by value. https://www.heathrow.com/company/cargo https://www.heathrow.com/company/cargo It's a major, major hub, not just for the UK but Europe, the US, and Rest of World.