Flyboy
Flyboy was a slang term for a pilot or airman.

In 2372, upon noting Julian Bashir and Miles O'Brien's Battle of Britain costumes, Quark asked what he could get the two flyboys. ()

In 2378, B'Elanna Torres referred to  flight control officer Tom Paris as a flyboy three times, once calling him a "Starfleet flyboy". She characterized them as being "all the same" and joked that upon returning back home, he'd abandon her and their daughter for the next piloting assignment that came his way. Paris assured her he would never do that. ()
Nicknames
Slang