Although MVY and ACK are exceptions I would disagree with you in general on the frac perspective. Most of my owners when told there is a weather issue will voluntarily delay their flight until things are better. That is not to say there aren't bad apples but that is the exception. My company doesn't do Cat II because we just don't fly then (explanation I was given). On top of that you have hundreds of more airports at your disposal, while you are limited with an island like MVY if a storm is sitting over ATL you go to FFC, PDK, 4A7, or FTY. Along with the fact that we tend to carry a lot more fuel for holding when conditions are iffy I have found frac flying to be a lot less bad weather flying and much less stress than 121. I doubt you will ever hear a FlexJet, FiveStar or ExecJet being a path finder. This could also just be the Beechjet, because if there is bad weather you can probably find a chart that says you can't go if you actually run the performance charts. Just my 2 cents.