Officials are increasing screening on airplanes , including cargo planes .

相关部门官员增强了对包括货运飞机在内的飞机航运的监察。

Nobody knew about airplanes or rockets .

没有人知道飞机或火箭。

China 's airlines have more than 800 boeing airplanes in service .

中国航空公司目前运营的波音飞机超过800架。

But how can natural gas power trucks and trains and airplanes ?

那么，如何用天然气驱动卡车、火车及飞机？

But people have been hurled through holes in cruising airplanes before .

但是以前的确有人在巡航高度从飞机上的洞被摔了出去。