Flying in sounds like a great idea, except that everyone with a checkbook big enough to pay for the flight is there too. As well as some that have their own plane. I've hunted the area, most airstrips are like campgrounds in hunting season, literally like a dozen or more tents along the runway. Who knows how many that camped away from the runway. A friend used to work for IDFG, he said the rule was pretty much 4 miles from an airstrip to see anything bigger than a 2 point buck. Most, if not all, airstrips also have at least on outfitter based out of there.
Its big country, not big like Colorado, but BIG! and steep. The few roads into the unit will have very high hunting pressure as well, with the roads often at the top of the ridge. I don't pack meat UPhill 5 miles.
I have hunted all 3 units. Some of it is easier to hunt than others, but animals numbers are not particularly high. And, from what I have seen, elk in that area are not very vocal, even at the peak of the rut.