This refers to a proposed aircraft or spacecraft that has not yet been built, tested, or flown. Engineers and procurement officers use the term to distinguish between proven hardware and theoretical designs that might look good in a presentation but lack physical validation. It carries a slightly cynical tone, reminding buyers that performance numbers are entirely estimated.
Heard on the job
The manufacturer promises a massive range increase, but right now it's just a paper airplane.
Also heard as
- paper plane
- vaporware
Related terms
Boilerplate
A non-functional spacecraft mockup used to test launch vehicles, recovery systems, and ground handling.
Homebuild
An aircraft constructed by an amateur builder rather than a certified factory.
Fleet leader
The specific aircraft or component in a fleet with the highest number of flight hours or cycles.