How Airports Serve West Virginia
Mark Pearson
This map displays the major airports in and around West Virginia. It shows how the state can divided according to which airport is the closest as the crow flies.
The flags are a sample of 484 census tracts (of 484 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/

CRW serves 1,002,582 people in WV
Yeager Airport

PIT serves 431,262 people in WV
Pittsburgh International Airport

IAD serves 227,384 people in WV
Washington Dulles International Airport

ROA serves 123,344 people in WV
Roanoke Regional Airport (Woodrum Field)

CHO serves 64,087 people in WV
Charlottesville-Albemarle Airport

TRI serves 4,335 people in WV
Tri-Cities Regional Airport (Tri-Cities Regional TN/VA)

dividing line

2,496 people
closest airport: ROA

7,457 people
closest airport: CRW

2,968 people
closest airport: CRW

closest airport: PIT

closest airport: CRW

closest airport: CHO

closest airport: IAD

closest airport: ROA

990 people

closest airport: TRI