How Airports Serve Michigan
Mark Pearson
This map displays the major airports in and around Michigan. 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 2756 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/

DTW serves 4,197,230 people in MI
Detroit Metropolitan Wayne County Airport

GRR serves 1,351,739 people in MI
Gerald R. Ford International Airport

FNT serves 1,238,959 people in MI
Bishop International Airport

LAN serves 711,473 people in MI
Capital Region International Airport (was Lansing Capital City)

MBS serves 699,691 people in MI
MBS International Airport

AZO serves 661,722 people in MI
Kalamazoo/Battle Creek International Airport

TVC serves 604,662 people in MI
Cherry Capital Airport

SBN serves 207,481 people in MI
South Bend Regional Airport

GRB serves 128,015 people in MI
Austin Straubel International Airport

CWA serves 56,524 people in MI
Central Wisconsin Airport

DLH serves 26,144 people in MI
Duluth International Airport

dividing line

1,907 people
closest airport: FNT

2,425 people
closest airport: DTW

2,997 people
closest airport: FNT

closest airport: DTW

closest airport: TVC

closest airport: GRR

closest airport: GRB

closest airport: AZO

closest airport: FNT

closest airport: SBN

closest airport: LAN

closest airport: MBS

9 people

36 people

closest airport: CWA

774 people

closest airport: DLH