Originally Posted by
AviatorAl04
I've always liked the 2 way comm est. = where the controller says "American xxx, standby" which means you are technically by the AIM cleared to enter the airspace. I wouldn't make an effort to push the limits with that one. but now, if the controller says "A/C calling, standby", no 2 way comm has been est. and you should keep doing circles or whatever you do when you wait to go into the airspace - I think most people know that one though.
I'm pretty sure that is just through Class C. Class B you need to hear the words "cleared through Bravo" and your tail/callsign. Although that is also VFR because if you get an IFR clearance and they clear you to the destination airport you're cleared through all the airspace between via the routing given.