There is no April 31.
“There is no April 31.”
December 32nd anyone?
RE the Lear Fan aircraft:
Lear’s goal was to make his prototype Lear Fan airworthy by December 31st, 1980. Its maiden flight, however, was on January 1, 1981. The British government, which helped fund the project, declared the LearFan’s first flight date “December 32nd, 1980” in honor of the late inventor’s hard work and determination.
The UK post office cancelled stamps with December 32nd on them.
https://www.bluewolfgallery.com/post/what-you-didn-t-know-about-bill-lear
That’s the joke.