Hmmm, I wonder if this relates to our little Oz airspace discusion -
Currently there is a big push in the US for "user fees" The Government wants to charge a $25 per flight user fee. This is being strongly resisted by the GA people and is currently held up in Congress and the Senate, but not defeated. President Bush has threatened a veto if some form of user fee on GA is not passed. With ADSB that can't be turned off their Airservices people will be able to not only charge a per flight fee but also a charge per mile fee
Extract via - you'll have to type it - ragandtubeaviator.blog and spot (one word) .com