I mean, Challenger went down very near the Florida coast, and everyone knew where. It's very easy to find stuff when you know where it is.

Granted, challenger broke up into many pieces, so any individual piece would be in an area, but the point is that's way easier than trying to find "a plane" - If you're referring to MH370 or similar, you're looking in a much less well defined area. The ocean is very big.

And, fireballs and atmospheric breakups are chaotic. Shit happens. A drop of burning fuel here, more air pushing flames away from there. When something breaks up as thoroughly as Challenger did, you'll always find things that have no right being as undamaged as they are, just by statistics - Ridiculously unlikely things are bound to be found once or twice if you look at thousands of examples.

So I don't even know what point you're trying to make, but.... No.