10. LAPCAT A2 – Great Britain
Producers: Reaction Engines Ltd.
Main Users: Future Commercial Flights from Sydney to Brussels
Program Price: Not Specified Amount spent: $1.1 billion
The British aerospace business in charge of building this aircraft has put a lot of time and work into it, even though it hasn’t been built yet. The aircraft, known as the LAPCAT A2, will have an engine system that can accomplish feats previously considered unattainable.

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In just four hours, the LAPCAT A2 is expected to carry 300 passengers anywhere in the world! Because of this project’s extreme ambition, it will cost an astounding 1.1 billion dollars to develop.
