The problem with these flow through agreements is not only the cyclical nature of this industry but also the fact that they are never straightforward, explicit or binding in any way.
So in addition to the unpredictability of the industry you have the unpredictability of how management will interpret the agreement or in fact if management will throw out the agreement altogether at any future date for any reason (e.g. to sell off the regional). The bottom line is that these agreements are good for management as it enables them to dangle the carrot in your face, yet ultimately management can do anything they want and the agreement is not worth the paper it is written on.
If you go to a specific regional with the hope to flow through to a particular major you will most likely be disappointed. Instead, get you turbine PIC, become marketable and then go where you can go based on the market conditions.