TaxSrv wrote:

Another aspect is much of the money now
comes from the airline ticket tax, and under user fees that's gone, so
the airlines would have to pay their user fees as a pure expense item.

Most of the push for user fees comes from the larger airlines. As it is, their
tickets are the most expensive, so they're paying more in taxes than short haul
providers. Put user fees in and the short haulers pay more. They're making more
takeoffs and landings, so they use more ATC services. The big carriers would pay
less because their flights tend to be longer with fewer T/Os and Ls.

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.