I'm guessing you know UNCLOS allows helicopters to fly during strait transits because they're considered the "normal operating mode" of the ship or some such language. Land-based assets don't have the freedom of curly-cueing around for hours, and how often is an LHx helping the DDG escort M/Vs through straits?
Romeos have to do because we're there and considered part of the ship.
I've seen it at the squadron and Task Force/Fleet level of planning. Having now seen the sausage being made at NAVCENT and the TFs, they've gotten it down to a fairly robust set of expectations from all the local players available. I was actually impressed at the level of coordination when we pushed some MCMs out of the Gulf to show the flag.