A pejorative name for contrails - the lines left in the sky ...
A single-seater helicopter that is made by a 20-year-old ...
A highly accurate tachometer that shines a laser beam on ...
Also called drones over U.S., surveillance society is a ...
A sonic boom is the loud sound created by the shock waves ...
The Boeing 747-8 Intercontinental is a wide-body commercial ...
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