"A Lieberman" wrote:

It happens often, especially when you fly into big city airspace. I
always get cleared direct from Mobile to Houston or Dallas, but then
Center always amends my clearance before I get to the Bravo airspace.

Can I assume that the amendment would be vectors to an approach or an
arrival procedure where ATC will vector you?

Yes. Going into HOU or DAL it's usually a STAR.

Or is it assumed you will know how to get on the airway from a non
standard
"entry" from a direct routing you are on?

Well, I've never been directed to join an airway without being given a
heading to fly to do it. If ATC has a route change for you, it will
usually begin with a fix, such as "direct Gregg County (VOR), DUMPY2
arrival, direct."

I ask this as I am planning a trip up to Ohio which would take me
through
Cincinnati Bravo from Owensboro KY to Stuebenville Ohio.

I would assume, that I get my clearance direct from OWB to 2G2, but
expect
vectors in and around Cincy Bravo "for traffic". Would this be the
amendment you would be talking about?

Well, vectors for traffic can happen any time in busy airspace, but
usually don't involve route waypoint changes. Once the traffic is no
factor, they'll tell you to resume own navigation, IOW, head for the
next fix or get back on the airway, if that was your clearance.

However, the TRACON might have regular routes for transients to fly
through parts of its airspace. If that's the case, you'll probably be
given the change before you get there. That will give you a little time
to set up your NAV gear.

If you're not landing there or busting through one of their approach or
departure corridors, you may not get any change at all.

--
Dan
C172RG at BFM