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
Got a chance to put about 40 minutes, between rain showers, on Mike Globensky's new, first in US, Bionix-13. Very nice! So light in roll, unlike the 15, which for me is quite a bit stiffer.
As mike's airspeed indicator only goes to 100 mph, (new air speed ind. on order) I couldn't tell what the top end was, but the low end trim was about 57 mph. He's had it for two weeks now and doubts it can get better than this.
Hope to get better weather in a few days and spend some more time with it.