What state are you in? I'm in GA and most of the bases within about 75 miles of my house are rural. The trend here is to keep the helicopters in the places that the calls originate rather than sending them from the cities to the calls as it's a delay. They do a mix of scene calls and transfers. I would suggest that you ask the individual services about the specifics and talk to the crews. I have been missing my EMS days and I think this would be a good way to use all of my skills.
I actually had an interview today with one of the big flight services in my area. I have 7 years EMS (5 as a medic) and just under 5 years as a RN (primarily ER, some ICU in a small hospital). I aced the tests and I think the interview went well. I have my ACLS, PALS, BLS & BLS instructor, GA EMS instructor (I think this was a huge selling point), some of the NIMS courses (100, 200, 700, I think), and TNCC. I was a bit surprised that I got an interview and even more surprised at how well it seemed to go. Ultimately I think that experience and certs are how you get your foot in the door, but it's up to you and your personality from there. I think it also depends on how competitive your area is. For the services in my area, they prefer experience in education as they do a lot of community outreach and a lot of training. They also expect you to be customer service oriented (I know, we all hate that lol). I think this company is a good fit for me personally and I really hope they offer me the job. I should know something in a couple weeks.