Will resolve as YES if it is at least partially submerged in a lake, river or other significant body of water when it is located. If it has broken up, then it will resolve YES of any significant part of the plane is under water (I will use my own judgement).

Edit: Question will close after two months. If the plane has not been found within that timescale, then this question will resolve as N/A.

I will not bet since there's the possibility of a subjective judgement being required on the resolution.

https://www.nbcnews.com/news/us-news/f-35-fighter-jet-missing-pilot-ejects-mishap-rcna105534

Have you seen a missing fighter jet? U.S. asks for help after ‘mishap’

U.S. authorities asked the public for help finding an F-35 fighter jet that went missing somewhere over South Carolina when the pilot ejected due to a “mishap.”