Strike First // Shutterstock

- Passengers: 3,957 (0.5% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 3,823
--- #2. Southwest Airlines: 134

#15. Los Angeles International (Los Angeles, CA)

Brittx // Shutterstock

- Passengers: 5,243 (0.6% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 5,243

#14. Orlando Sanford International (Sanford, FL)

Canva

- Passengers: 5,341 (0.6% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 5,341

#13. St Pete Clearwater International (St. Petersburg, FL)

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- Passengers: 8,870 (1.1% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 8,870

#12. Eglin AFB Destin Fort Walton Beach (Valparaiso, FL)

Nate Hovee // Shutterstock

- Passengers: 8,893 (1.1% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 8,878

#11. Phoenix Sky Harbor International (Phoenix, AZ)

Nate Hovee // Shutterstock

- Passengers: 17,488 (2.1% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 17,488

#10. Phoenix - Mesa Gateway (Phoenix, AZ)

ostreetphotography // Shutterstock

- Passengers: 20,161 (2.4% of all passengers)
- Top carriers:
--- #1. SkyWest Airlines: 16,187
--- #2. Endeavor Air: 3,907

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

kan_khampanya // Shutterstock

- Passengers: 21,255 (2.6% of all passengers)
- Top carriers:
--- #1. Horizon Air: 21,249

#8. Seattle/Tacoma International (Seattle, WA)

randy andy // Shutterstock

- Passengers: 25,531 (3.1% of all passengers)
- Top carriers:
--- #1. Allegiant Air: 15,908
--- #2. Southwest Airlines: 9,563

#7. Harry Reid International (Las Vegas, NV)

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- Passengers: 58,848 (7.1% of all passengers)
- Top carriers:
--- #1. SkyWest Airlines: 25,614
--- #2. Mesa Airlines: 17,562
--- #3. CommuteAir LLC dba CommuteAir: 8,091

#6. George Bush Intercontinental/Houston (Houston, TX)

Joe Hendrickson // Shutterstock

- Passengers: 61,064 (7.4% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 61,020

#5. St Louis Lambert International (St. Louis, MO)

marchello74 // Shutterstock

- Passengers: 102,246 (12.4% of all passengers)
- Top carriers:
--- #1. SkyWest Airlines: 31,196
--- #2. United Air Lines: 29,757
--- #3. Envoy Air: 24,309

#4. Chicago O'Hare International (Chicago, IL)

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- Passengers: 108,796 (13.2% of all passengers)
- Top carriers:
--- #1. Delta Air Lines: 107,817
--- #2. Southwest Airlines: 513
--- #3. Endeavor Air: 466

#3. Hartsfield-Jackson Atlanta International (Atlanta, GA)

Andrew Zarivny // Shutterstock

- Passengers: 178,792 (21.7% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 86,356
--- #2. SkyWest Airlines: 39,127
--- #3. United Air Lines: 29,433

#2. Denver International (Denver, CO)

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- Passengers: 190,605 (23.2% of all passengers)
- Top carriers:
--- #1. American Airlines: 121,539
--- #2. Envoy Air: 56,512
--- #3. SkyWest Airlines: 6,512

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. Dallas/Fort Worth International (Dallas/Fort Worth, TX)