How Airports Serve Kentucky
Mark Pearson
This map displays the major airports in and around Kentucky. 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 1110 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/

SDF serves 1,267,618 people in KY
Louisville International Airport (Standiford Field)

LEX serves 1,221,961 people in KY
Blue Grass Airport

EVV serves 499,884 people in KY
Evansville Regional Airport

CVG serves 453,820 people in KY
Cincinnati/Northern Kentucky International Airport

BNA serves 375,177 people in KY
Nashville International Airport (Berry Field)

TRI serves 194,947 people in KY
Tri-Cities Regional Airport (Tri-Cities Regional TN/VA)

CRW serves 193,516 people in KY
Yeager Airport

TYS serves 125,631 people in KY
McGhee Tyson Airport

MEM serves 6,813 people in KY
Memphis International Airport

dividing line

4,217 people
closest airport: LEX

2,570 people
closest airport: LEX

3,037 people
closest airport: CRW

closest airport: SDF

closest airport: BNA

closest airport: EVV

closest airport: LEX

closest airport: TYS

closest airport: CVG

closest airport: CRW

947 people

closest airport: TRI

closest airport: MEM

18 people

6 people