Jon Bilous // Shutterstock

- Passengers: 18,142 (2.0% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 18,142

#20. Missoula Montana (Missoula, MT)

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- Passengers: 18,581 (2.0% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 18,581

#19. South Bend International (South Bend, IN)

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- Passengers: 19,044 (2.1% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 19,044

#18. Tri Cities (Pasco/Kennewick/Richland, WA)

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- Passengers: 19,502 (2.1% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 19,502

#17. Mahlon Sweet Field (Eugene, OR)

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- Passengers: 19,795 (2.1% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 19,795

#16. Bozeman Yellowstone International (Bozeman, MT)

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- Passengers: 22,813 (2.5% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 22,813

#15. Rapid City Regional (Rapid City, SD)

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- Passengers: 23,262 (2.5% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 23,262

#14. Chicago/Rockford International (Rockford, IL)

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- Passengers: 24,398 (2.6% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 24,398

#13. Billings Logan International (Billings, MT)

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- Passengers: 24,805 (2.7% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 24,805

#12. General Downing - Peoria International (Peoria, IL)

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- Passengers: 25,378 (2.7% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 25,378

#11. Springfield-Branson National (Springfield, MO)

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- Passengers: 26,568 (2.9% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 26,568

#10. Des Moines International (Des Moines, IA)

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- Passengers: 28,156 (3.0% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 28,156

#9. Idaho Falls Regional (Idaho Falls, ID)

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- Passengers: 28,207 (3.0% of all passengers)
- Top carriers:
--- #1. Sun Country Airlines d/b/a MN Airlines: 15,523
--- #2. Allegiant Air: 11,565
--- #3. Swift Air, LLC d/b/a Eastern Air Lines d/b/a Eastern: 1,119

#8. Minneapolis-St Paul International (Minneapolis, MN)

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- Passengers: 30,919 (3.3% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 30,919

#7. Appleton International (Appleton, WI)

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- Passengers: 30,982 (3.3% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 30,982

#6. Gerald R. Ford International (Grand Rapids, MI)

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- Passengers: 32,097 (3.5% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 32,097

#5. The Eastern Iowa (Cedar Rapids/Iowa City, IA)

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- Passengers: 32,727 (3.5% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 32,725

#4. Bismarck Municipal (Bismarck/Mandan, ND)

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- Passengers: 46,395 (5.0% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 46,395

#3. Hector International (Fargo, ND)

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- Passengers: 48,461 (5.2% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 48,461

#2. Joe Foss Field (Sioux Falls, SD)

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- Passengers: 102,210 (11.0% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 102,210

This story features data reporting by Rob Powell, writing by Jaimie Etkin, and is part of a series utilizing data automation across 199 metros.

#1. Provo Municipal (Provo, UT)