In real life, if I were to meet a stranger who is a young woman around my age in Japan, how would I--a man--call her without knowing her name? For instance, how should I say, "Excuse me, miss, you're up (in a queue)."
A search on the Internet turned up one result dominantly--お姉さん.
However, from memory I believe I've heard another term (if not more often) in Japanese films and anime--お嬢さん.
Somehow I feel calling any random young lady on the street お姉さん slightly off.