Originally Posted by
peekay4
The problem is that the intended airport may close for reasons other than weather. Security situations, accidents, fires, ATC or NAV/COM issues, natural disasters, etc.
So it's a good idea to always have enough fuel to reach an alternate airport, plus reserves, even if not required by regulations.
Yeah, I don't think I would want to put all my eggs in one basket by having my only "diversion" be a different runway. At the very least, I'd want to know that there was somewhere else I could reach in a "worst case" scenario, even if that was somewhere that would normally be off-limits. (Military base, slightly under limits runway length, etc.)