I flew corporate for over 10 years before I finally was in the airlines full time, I had to resource to go back a couple of times seaking refuge from airline shut downs in the 90's and after 9/11. It is a hard thing to accomplish since as some have pointed out, it will be costly because you will have to start from the bottom again, thus the entry level salary being low for sure. I finally made the solid jump at 36. The first step of leaving corporate is, leaving corporate! You will have to take the plunge and take whatever low paying airline job you can find so that you can start getting some experience in the industry, you need airline time in your logbooks to get any decent airline job, so the first step is to get the time with not such a decent job. The road ahead will be hard but flying corporate sucks, I would have rather just leave aviation all together if I wasn't able to change to the airlines. The best of luck