SOLVED. YA fiction. Kids survive hijacked plane crash and then survive in wilderness.

[Sarah]

I read a book in the 1990s (probably written in 1970s or 1980s) about at least one boy (possibly more kids) who was on a plane that was also transporting a criminal handcuffed between two US marshals. The criminal gets loose on the plane and hijacks it, causing a crash, which he and the kids survive. The criminal poses as a survived US marshal, earning the kids' trust as they fight to survive in the wilderness, until one of the kids notices that there are handcuff marks on both of the man's wrists, indicating he had been handcuffed in the middle (i.e., with a marshal on either side), and the plot changes to the kids having to survive both the wilderness and a criminal trying to keep his secret.

[Sarah]

...actually, I think it was probably this book: https://www.goodreads.com/book/show/2...

[Sarah]

Yes, it's definitely Two for Survival. Not sure how to mark this as solved.