The United States Federal Aviation Administration says most large passenger planes now use HEPA filters.

美国联邦航空局说现在绝多数大型客机使用高效微粒空气过滤器。

youdao

This is not the first plot involving passenger planes that Britain's security services have become aware of.

这不是英国保安发现的第一起涉及客机的阴谋。

youdao

Their troubles began in the 1950s when they started flying higher and needed to pressurise the cabins of their passenger planes.

20世纪50年代当他们开始飞得更高而且需要给他们的客机座舱增压时，他们的麻烦就开始了。

youdao

Visitors can find everything from old passenger planes to new unmanned aircraft, like the Predator drone.

VOA: special.2010.07.30

The United States Federal Aviation Administration says most large passenger planes now use HEPA filters.

VOA: special.2009.07.14

Today's large passenger planes have fewer but more powerful engines than older models.

VOA: special.2009.04.01

Or the chances that passenger planes would destroy the two largest buildings in New York?

FORBES: The New Uncertainty

Among many who once built big passenger planes, only Boeing and Airbus Industrie still do.

FORBES: Perspectives

Russian police officers have taken relatively small bribes to allow suicide bombers onto passenger planes.

CENTERFORSECURITYPOLICY: Security obstacles abound