大飞机之名因何而来:“大飞机”一般定义为起飞重量超过100吨的运输类飞机,包括军用大型运输机、民用大型运输机和150座级以上的干线飞机。大飞机一词,可以说是国人在对祖国航空工业的巨大期盼中创造出来的专用词语。
自2003年国家科技部受国务院委托组建“大飞机项目论证组”后,该词逐渐被普遍使用。对应上述定义,民用客机能称为大飞机的最小级别是波音公司的B737飞机、空客公司的A320飞机以及中国商飞的C919飞机。 民用飞机的干支之分:干线飞机是指在客运量较大的城市间飞行、载客量在100人以上的客机;支线飞机是指航行于小城市之间或中心城市与小城市之间、100座级以下的客机。干线飞机大体可分为150座、200座、300-500座等级别以及正在发展的600-1000座级客机。在干线飞机中,150-200座级的商用飞机具有特殊的重要意义,满足了航空市场对短程航线、低载客量的需求,因此最受航空公司的青睐;这个座级的机型也是干线飞机制造的起点机型和基本机型。 
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来源:中航军工研究