Hello VATSIMers,

I know that on VATSIM, if a controller isn't available, one should take the request up a level, but I wonder if someone could clarify a couple of scenarios for me.

For example, in the case where there's a tower controller at the primary airport inside class B airspace and center is online too, but no APP/DEP controller.  I assume I contact center for a clearance into the class B if I'm VFR?  

If I'm approaching a class D airfield with no tower and I'm VFR again, would I contact center to get permission into the D?

If I'm sitting at an airport inside class C airspace, do I contact center for clearance, taxi etc, even if VFR again?

So far, I'm really enjoying VATSIM.  It's a huge improvement over practicing approaches etc with the AI ATC.

PS I know that I could file IFR and get all the clearance I needed, but what's the fun in that?