if others are thinking and/or working along the same lines, and see if perhaps a TEAM could be set up
I'm always reluctant to appear negative when someone comes up with an idea and asks for comments - but the system you describe (unless you hit it lucky with a commercial backer) would most likely have to come with a whopping great health warning - Not To Be Used For Air Navigation" (for reasons already stated)
As a software person you will have asked yourself the question many times - "Am I proposing to build an application to solve a problem?" - Or building an application that's looking for a problem to solve...
Whils't it looks like the project looks "relatively" straightforward from a technical perspective the data sourcing and updating, system updates, and all the other baggage that inevitably accompanies any software release looks like it might be extremely time consuming even for a small army of volunteer coders and helpers.
Much of the best open source stuff started life in a university or as a business application with people being paid or funded to do all the graft..
Prove to me there is a 'market' for this and I may be interested in doing a bit for "the team."