Airlines

Major U.S. Airlines

Delta Air Lines

#1

DL17.8%United States

SoutheastNortheastMidwest+1

American Airlines

#2

AA17.5%United States

TexasSoutheastMidwest+1

Southwest Airlines

#3

WN17.0%United States

SouthwestTexasCalifornia+1

United Airlines

#4

UA16.8%United States

MidwestMountain WestWest Coast+1

Alaska Airlines

#5

AS6.6%United States

Pacific NorthwestAlaskaWest Coast+1

Hawaiian Airlines

#6

HA1.3%United States

HawaiiWest CoastJapan/Pacific

Operated under the Alaska Airlines certificate since Oct 2025

JetBlue Airways

#7

B64.6%United States

NortheastFloridaCaribbean

Low-Cost / Ultra-Low-Cost

Frontier Airlines

#1

F93.7%United States

Mountain WestMidwestSouthwest+1

Spirit Airlines

#2

NK3.0%United States

FloridaNortheastSoutheast+1

Allegiant Air

#3

G4~1%United States

FloridaLas VegasSouthwest+1

Sun Country Airlines

#4

SY~1%United States

MidwestMinnesotaLeisure markets

Breeze Airways

#5

MX<1%United States

SoutheastNortheastFlorida

Avelo Airlines

#6

XP<1%United States

NortheastFloridaSouthern U.S.

Regional Airlines

These carriers operate a huge share of regional flying, usually branded as Delta Connection, American Eagle or United Express.

SkyWest Airlines

#1

OO2.6%United States

Mountain WestWest CoastMidwest

Envoy Air

#2

MQUnited States

American Airlines regional network

YX

Republic Airways

#3

YXUnited States

NortheastMidwestEast

OH

PSA Airlines

#4

OHUnited States

Eastern & Midwestern U.S.

Endeavor Air

#5

9EUnited States

Delta regional network

QX

Horizon Air

#6

QXUnited States

Pacific NorthwestWest

Mesa Airlines

#7

YVUnited States

SouthwestUnited regional network

C5

CommuteAir

#8

C5United States

United Express network

Air Wisconsin

#9

ZWUnited States

MidwestEast