曾几何时，道格拉斯航空公司、麦克唐纳航空公司、北美航空公司和洛克·维尔国际公司都是太空计划的参与者。
At one time, Douglas Aircraft, McDonnell Aircraft, North American Aviation and Rockwell International were all players in the space program.
曾几何时，道格拉斯航空公司、麦克唐纳航空公司、北美航空公司和洛克·维尔国际公司都是太空计划的参与者。
At one time, Douglas Aircraft, McDonnell Aircraft, North American Aviation and Rockwell International were all players in the space program.
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