Revealed: History's Most Expensive Military Vehicles

10. LAPCAT A2 – Great Britain

Producer: Reaction Engines Ltd. Planned user: Future Sydney–Brussels commercial service Program spend: $1.1 billion The conceptual LAPCAT A2 seeks to redefine global travel with a propulsion system built for extreme speed.

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Designed to whisk 300 passengers anywhere on Earth in four hours, it stands as one of aviation’s boldest visions.