I think despite the "small-print" of the discussion, we all agree it is at the discretion of the "victim" to decide whether the flying/invisible character is noticed or not. Personally, I always make sure my character doesn't react to a flying/invisible character, unless (as Mele stated earlier) they fly in and out, in and out. Why do I always do this?
Because I would always prefer people to do the same for me (incidentally, if they don't, I don't complain I just roll with it because as mentioned, its up to them). My character has a reasonably high level in sneak (elves either used to get it, or still get it, I can't remember). If she enters a room sneaking and invisible, there's a strong chance nobody will hear her. However... if I cast flight upon myself (thereby removing the need to sneak quite as much, due to no foot-falls), and then fly into a room,
everyone automatically knows I am there. That's the issue. That people can automatically know someone is there. I'd prefer people to give flying invisibles the benefit of the doubt. Not because I'm a power-hungry wizard-player desperate to spy on people (I can use much better spells for that), but because its a general give-and-take thing.
There are several small inconsistencies in code on the MUD, which just rely on people working together and accepting things. As I've said, I don't mind if people say they can spot me when I'm sneaking, flying and invisible (even if logically, it makes absolutely perfect sense that an experienced wizard knows how to fly slowly as well as quickly). Its not that big a thing. But sometimes it'd be nice if people would OOC ignore the mandatory "someone flies in from the <direction>" echo that anyone (even the most sneakiest sneaky rogue in existence) gives off automatically. I will continue to ignore the flying echoes. But don't feel bound to do the same, its the choice of the "victim" as (I think?) we've all agreed on already.
If you have knowledge, let others light their candles with it.
--Sir Winston Churchill
"This place is boring, I'm gonna go eat whatever I can find laying on the ground"
-- Hoildric
Cacie asks Larethiel 'Did that air just bow to you?