Would-be supersonic business jet makers continue to advance their designs while awaiting certain key ingredients despite indicators that the executive market is ready for higher speed aircraft. Start-up manufacturer Aerion reports that it has taken nearly 40 letters of intent for its 12-seat M1.6 twinjet, up from the 20 reported in December, increasing the order backlog to more than $3 billion. The company is taking $250,000 refundable deposits through sales agents ExecuJet and Aero Toy Store. Holding up the Nevada-based company, however, is an agreement with an established original equipment manufacturer to build the aircraft.
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机译：可能的超音速公务机制造商在等待某些关键因素的同时继续改进设计，尽管有迹象表明行政市场已为高速飞机做好了准备。初创企业制造商Aerion报告说，它的12座M1.6双引擎喷气飞机已经收到了将近40份意向书，比去年12月的20份有所增加，使订单积压增加到30亿美元以上。该公司正在通过销售代理商ExecuJet和Aero Toy Store收取25万美元的可退还押金。然而，与一家建立在内华达州的原始设备制造商达成协议是建立这家飞机的协议。
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