How Airports Serve Arizona
Mark Pearson
This map displays the major airports in and around Arizona. It shows how the state can divided according to which airport is the closest as the crow flies.
The flags are a sample of 500 census tracts (of 1520 tracts total) within the state.
Some census tract flags may look like they are colored for one airport's region but are actually in another airport's region. The census tract flags are colored with which airport they are closest to as the crow flies along the surface of the earth (the Haversine distance formula). The region boundaries that are displayed on map were computed assuming assuming the earth is flat. (The lines that divide regions are a Voronoi diagram, and I couldn't find any algorithm that calculate the lines on a sphere such as the earth.) In short, although a few census tracts may look like they're mislabeled near a boundary, it's actually the boundary that is slightly wrong.
For more information, see the full report:
http://www.mark-pearson.com/airport-distances/

PHX serves 3,264,280 people in AZ
Phoenix Sky Harbor International Airport

TUS serves 1,216,801 people in AZ
Tucson International Airport

IWA serves 1,198,440 people in AZ
Phoenix-Mesa Gateway Airport

GCN serves 265,987 people in AZ
Grand Canyon National Park Airport

IFP serves 209,147 people in AZ
Laughlin/Bullhead International Airport

PSP serves 188,567 people in AZ
Palm Springs International Airport

DRO serves 46,574 people in AZ
Durango-La Plata County Airport

ABQ serves 2,221 people in AZ
Albuquerque International Sunport

dividing line

5,525 people
closest airport: IWA

4,283 people
closest airport: PHX

3,926 people
closest airport: IWA

closest airport: PSP

closest airport: IWA

closest airport: PHX

closest airport: TUS

closest airport: IFP

closest airport: GCN

closest airport: DRO

502 people
closest airport: PSP

684 people

17 people

closest airport: ABQ