Why?
A plane is not a fly and does not stay aloft like a fly, yet we describe what it does as flying despite the fact that it does not flap its wings. What are the downsides we encounter that are caused by using the word “fly” to describe a plane travelling through the air?
Flying doesn't mean flapping, and the word has a long history of being used to describe inanimate objects moving through the air.
"A rock flies through the window, shattering it and spilling shards everywhere" - see?
OTOH, we have never used to word "swim" in the same way - "The rock hit the surface and swam to the bottom" is wrong!