a flight of fancy

flight of fancy

An imaginative but unrealistic idea. No one took his campaign for office seriously because his proposed solutions to problems were filled with flights of fancy.
See also: fancy, flight, of
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

a flight of fancy

or

a flight of fantasy

COMMON If you call an idea, statement, or plan a flight of fancy or a flight of fantasy, you mean that it is imaginative but not at all practical. This is no flight of fancy. The prototype is already flying, and production is to begin next year. The idea that you could use these satellites as weapons is a complete flight of fantasy.
See also: fancy, flight, of
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

a ˌflight of ˈfancy

an idea or a statement that is very imaginative but not practical or sensible: The idea is not just a flight of fancy. It has been done before.
See also: fancy, flight, of
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in periodicals archive ?
BIRMINGHAM art lovers are invited to go on a flight of fancy.