I was sort of kidding about the dive bombing. Mostly was just
wondering if they navigate by smell, and can figure the location of
something. Given the nature of flies, for instance, they're probably
quite good at it.

Well, my brain is starting to engage, and since you mention flies, the
Paw Paw (Asimina triloba) is pollinated by flies, and farmers used to
hang rotting meat in the orchards to attract flies. So in that case I
think we can clearly say "yes" to navigation by smell.

I don't know, my favorite book about insect biology is "For the love
of insects" (by Thomas Eisner) but that one is almost exclusively
about chemical defenses, not about attraction. I don't know if
someone has written something similar about the latter.