Andrew Zarivny // Shutterstock

- Passengers: 6,600 (0.8% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 4,848
--- #2. SkyWest Airlines: 1,752

#14. Denver International (Denver, CO)

f11photo // Shutterstock

- Passengers: 8,300 (1.0% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 8,300

#13. Baltimore/Washington International Thurgood Marshall (Baltimore, MD)

TommyBrison // Shutterstock

- Passengers: 8,459 (1.1% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 8,459

#12. Kansas City International (Kansas City, MO)

marchello74 // Shutterstock

- Passengers: 11,920 (1.5% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 11,920

#11. Chicago Midway International (Chicago, IL)

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- Passengers: 16,793 (2.1% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 15,301
--- #2. Envoy Air: 1,439

#10. Austin - Bergstrom International (Austin, TX)

Orhan Cam // Shutterstock

- Passengers: 20,190 (2.5% of all passengers)
- Top carriers:
--- #1. PSA Airlines: 13,662
--- #2. Republic Airline: 6,071
--- #3. American Airlines: 399

#9. Ronald Reagan Washington National (Washington, DC)

Joe Hendrickson // Shutterstock

- Passengers: 37,569 (4.7% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 37,569

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

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- Passengers: 38,697 (4.8% of all passengers)
- Top carriers:
--- #1. CommuteAir LLC dba CommuteAir: 38,357
--- #2. Mesa Airlines: 320

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

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- Passengers: 45,961 (5.8% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 45,952

#6. William P Hobby (Houston, TX)

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- Passengers: 63,450 (7.9% of all passengers)
- Top carriers:
--- #1. PSA Airlines: 37,024
--- #2. American Airlines: 25,075
--- #3. Envoy Air: 1,296

#5. Charlotte Douglas International (Charlotte, NC)

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- Passengers: 72,034 (9.0% of all passengers)
- Top carriers:
--- #1. American Airlines: 46,894
--- #2. Envoy Air: 19,853
--- #3. Mesa Airlines: 2,706

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

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- Passengers: 79,500 (10.0% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 79,500

#3. Dallas Love Field (Dallas, TX)

Brian Wilson Photography // Shutterstock

- Passengers: 108,642 (13.6% of all passengers)
- Top carriers:
--- #1. Southwest Airlines: 108,642

#2. Nashville International (Nashville, TN)

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- Passengers: 268,815 (33.7% of all passengers)
- Top carriers:
--- #1. Delta Air Lines: 268,813

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. Hartsfield-Jackson Atlanta International (Atlanta, GA)