Finding out if an airport authority is even interested in having an event at their airport is a good starting point. If they aren't, you might start looking elsewhere.
Money is the key factor, depending upon what type and how big a show you want to do. I've been involved in both low budget, grass-roots, type events as well as show with over 100,000 visitors.
I guess it helps to decide what type of event you'd like and go after sponsors who might be interested in what it can offer them as far as marketing benefits.
Many time it helps to hook up with a non-profit charity and make it the recipient of the proceeds. That can help with sponsors wanting to attach their name to an event.
The next thing you want to examine is how to create a core group of individuals who can get things done. Action people are what you need.
There are also many individuals out there that produce shows for a living. They may take a larger cut of the profits, but most of them assume a lot of the risk associated with events of this size. There are also many levels of experts out there who can help you "align" everything so that you are starting on the right foot.
Try looking atthe ICAS website. They can be a great help.
www.airshows.org
Well, that's all I'm up for right now. I got to get up early!
Good luck Glenn!
Jerry