Gap Fill - Supersonic Jets - Level 2

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   airliner      commercial      cost      first      fuel      orders      profitable      same      ticket      tickets  

Paragraph 2

The jets ordered by United Airlines will be the supersonic jets to make flights since 2003. The of the supersonic tickets will be about the as regular business class tickets. Previously, the cost of a on a supersonic was over 20 times higher than economy class . Only the super-rich could afford one. The new planes will be more fuel-efficient and . Flights will be net-zero carbon and use sustainable . The cost of each airplane is approximately $200 million. Boom already has around $6 billion in .

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