[/nq] I am one of those many, though I wouldn't use the term that way if it might cause confusion. If I were on the second floor directing someone to the third floor, I'd say "one flight up", regardless of any landings in between. [nq:1]To my mind, however, a flight of stairs is those stairs between two landings.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.