Is there a single word to describe birds that can fly? Am I struggling to think of a word because the default notion of a bird is that it can fly? So we generally only need to differentiate the ones that can't fly.
I've seen the term "winged" in a few google searches, but to my mind an ostrich is winged, but it is also flightless.
I guess I'm looking for the word you'd put into this blank:
Penguins are flightless because they cannot fly.
Ostriches are flightless because they cannot fly.
Pigeons are ____ because they can fly.