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
Been Flying trikes and only trikes for 13 years, started when I was 63 and will be 76 this May, 2015
Have almost 1800 hours as of Jan 2015. Avg. abnut 160 hrs/yr
I have 3 trikes; 2 ea. AC Clipper 912 and an Apex Cross-5 HKS
Have 3 wings 1 ea. ixess-13, 2 ea. iXess-15.