It looks like about 54 airports as of 2013. Quite counting since then. These are the states I've flown in;
Hawaii CA AZ NV WA OR UT NM FL
The picture is of Sue & I @ the Copper State Fly-In in Casa Grande, AZ, 3years ago.
Here is a list and map of all the places I have flown into as of 2013.
All of it has been xc in my trikes except for Florida, Washington and Hawaii
ElDorado dry lake, NV Boulder city BVU Echo bay Calvada Medows Pahrump
Peoria, AZ Furnace Creek Jean Dry Lake Marana AZ Lake Havasu City
Ivanpah dry lake Tiger Field Fernley NV. SilverSpring NV. Dayton Airpark NV
Many airports across Victoria, South Australia, New South Wales, Australia.
Home airfield is Latrobe Valley, Victoria