Airports Visited

I've been writing back and forth with a friend who's trying to plan a visit. Her question went something like this, "How can you have been in only 10 airports, when you can't fly directly to Houston from anywhere?"

And I responded, because I always go to the same places. And then I started adding up my airports, or the cities at least ...

Anchorage, AK (ANC - Anchorage International Airport)
Los Angeles, CA (LAX - Los Angeles International)
Seattle, WA (SEA - Seattle-Tacoma International Airport)
Phoenix, AZ (PHX - Phoenix International Airport)
Las Vegas, NV (LAS - Las Vegas McCarran International Airport)
Denver, CO (x 2, Stapleton AND DIA - Denver International Airport)
Midland, TX (MAF - Midland International Airport)
Houston, TX (IAH - Houston George Bush Airport)
Galveston, TX (GLS - Scholes International Airport at Galveston) - PHI helicopter ride
New Orleans, LA (MSY - Louis Armstrong New Orleans International Airport)
Detroit, MI (DTW - Detroit Metropolitan Wayne County Airport)
Orlando, FL (MCO - Orlando International Airport)
Big Island of Hawaii, HI (KOA - Kona International Airport at Keahole)
Moloka'i, HI (MKK - Molokai airport)
Hilo, HI (ITO - Hilo International Airport) - tourist helicopter ride
London, UK (LHR - Heathrow Airport?)

I'm not so sure which London airport I touched down and departed from.

So that's 17 I've flown in or out of, or both in the case of the helicopter rides.