See also ‘Lunar Aerodynes’.
In this context we are referring to vectored thrust aircraft, which are generally flying bricks without their power plants. While most other aircraft have lifting surfaces, the aerodyne is kept aloft solely by the power of its engines. Aerodynes tend to be very manoeuvrable and flying them can be tricky.
On Earth the most common types tend to be ‘Flying Cars’, generally used as toys of the very wealthy or more likely as specialist pursuit vehicles, and appearing in a range of configurations from saloon through to van.
There are military variants however, generally as troop carriers or specialist armor. The vast majority of armor is still ground based however.