Opponents reckon they have colluded in making up optimistic projections about the speed with which airlines will change to yet-to-be-built clean, quiet aircraft.

对于改用清洁、安静的飞机后可以对航空公司产生的变化，反对者们声称已经做出了最乐观的预测，尽管这飞机还没有研发出来。

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Critics of the aviation industry would like to see fuel-efficiency standards for new aircraft of the kind that are forcing rapid change in carmaking.

批评家希望通过研制新型飞机来提高燃料利用效率，正如汽车工业正面临的变革一样。

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But it is unlikely that the shape of subsonic aircraft will change radically in the foreseeable future.

但在可预见的未来，亚音速飞机的形状不会发生根本的改变。

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"One of the things we learn from accidents is to change the aircraft to making them safer, " said University of Southern California Professor Michael Barr.

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Specific terms and details of the deal may ultimately change, but at the moment it looks as though Lockheed will make 21 models of the aircraft for the Air Force, six for the Navy and three for the Marine Corp.

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Joseph Bruno, the state Senate majority leader, who has been at loggerheads with Mr Spitzer since the summer (Mr Spitzer's office accused Mr Bruno of abusing his aircraft privileges), says the policy change is unconstitutional and contradicts a federal act which requires, among other things, a valid Social Security number to get a driver's licence.

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