I wasn't aware that FAA funded any aspect of GPS; how much did they kick in? Also, I believe the raw data for some of what makes up navigation charts is also funded elsewhere because it is applicable to non-aviation uses. In the early decades while aviation was growing the federal government kicked in 0 (zero) dollars to build airports; but that did change some ... here's a quick history on government funding of airports:
Got numbers to back that assertion up? With respect to all of aviation, historically the rest of the Feds were freeloading on fuel taxes:
[FONT=Trebuchet MS, Arial, MS Sans Serif]"By 1980, the aviation trust fund had received about $13.8 billion but only $4.1 billion had been spent on the airport system. Many parties were fighting over how the money from the fund should be spent, so most of the money remained unused. The U.S. Treasury on occasion has “tapped” the fund to use the money for projects unrelated to airports.[/FONT]"