United States is the biggest commercial airline market in the world. 815 mln passengers per year, that is 2.3 airline passengers per person, making the US most flying nation on the Globe. The US traffic is dominated by four giants – Southwest Airlines, Delta Airlines, American Airlines and United Airlines. These 4 companies carried together more than 555 mln passengers, thus providing 65% of the total air traffic of US companies. All 4 are among the top-5 airlines in the World. Of course, USA has the biggest number of passenger airlines – 98 commercial air carrieers were registered by ICAO in 2017. 17 of them carried more than 10 mln passengers each, and 26 has the number of passengers more than 1 mln.
| Rank | RankWorld | NatRank | Air carrier | State | Passengers carried | Passsenger-km performed (x1000) |
| 1 | 1 | 1 | SOUTHWEST | UNITED STATES | 157 727 023 | 207 711 919 |
| 2 | 2 | 2 | DELTA | UNITED STATES | 145 615 803 | 315 204 655 |
| 3 | 3 | 3 | AMERICAN | UNITED STATES | 144 919 766 | 323 909 964 |
| 4 | 5 | 4 | UNITED | UNITED STATES | 107 161 566 | 310 463 650 |
| 5 | 17 | 5 | JETBLUE AIRWAYS | UNITED STATES | 40 013 865 | 76 016 833 |
| 6 | 18 | 6 | SKYWEST AIRLINES | UNITED STATES | 35 775 961 | 30 297 526 |
| 7 | 36 | 7 | ALASKA | UNITED STATES | 26 110 618 | 56 802 661 |
| 8 | 44 | 8 | SPIRIT AIRLINES | UNITED STATES | 23 812 748 | 39 586 884 |
| 9 | 62 | 9 | REPUBLIC AIRLINES | UNITED STATES | 16 931 742 | 16 161 012 |
| 10 | 63 | 10 | FRONTIER AIRLINES | UNITED STATES | 16 799 968 | 30 425 185 |
| 11 | 68 | 11 | EXPRESSJET AIRLINES INC. | UNITED STATES | 15 501 856 | 12 246 091 |
| 12 | 79 | 12 | MESA AIRLINES | UNITED STATES | 13 430 288 | 12 123 712 |
| 13 | 81 | 13 | PSA | UNITED STATES | 12 629 465 | 7 934 639 |
| 14 | 84 | 14 | ALLEGIANT AIR | UNITED STATES | 12 397 086 | 17 979 716 |
| 15 | 89 | 15 | Envoy Air | UNITED STATES | 11 789 693 | 9 412 397 |
| 16 | 90 | 16 | ENDEAVOR AIR | UNITED STATES | 11 783 008 | 9 357 776 |
| 17 | 92 | 17 | HAWAIIAN AIRLINES | UNITED STATES | 11 299 773 | 26 227 836 |
| 18 | 121 | 18 | VIRGIN AMERICA | UNITED STATES | 8 398 287 | 20 847 103 |
| 19 | 140 | 19 | HORIZON AIR | UNITED STATES | 7 018 189 | 3 770 649 |
| 20 | 150 | 20 | COMPASS AIRLINES USA | UNITED STATES | 5 897 455 | 6 236 297 |
| 21 | 164 | 21 | GOJET AIRLINES | UNITED STATES | 5 306 137 | 4 371 175 |
| 22 | 208 | 22 | AIR WISCONSIN | UNITED STATES | 3 600 148 | 2 095 990 |
| 23 | 211 | 23 | TRANS STATES AIRLINES | UNITED STATES | 3 460 074 | 2 442 041 |
| 24 | 222 | 24 | PIEDMONT AVIATION | UNITED STATES | 3 053 625 | 1 203 608 |
| 25 | 229 | 25 | SUN COUNTRY | UNITED STATES | 2 919 220 | 6 314 924 |
| 26 | 292 | 26 | COMMUTAIR | UNITED STATES | 1 590 944 | 751 299 |
| 27 | 377 | 27 | SWIFT AIR | UNITED STATES | 643 879 | 834 847 |
| 28 | 381 | 28 | SILVER AIRWAYS | UNITED STATES | 627 252 | 219 788 |
| 29 | 383 | 29 | Cape Air | UNITED STATES | 618 722 | 108 225 |
| 30 | 408 | 30 | ISLAND AIR HAWAII | UNITED STATES | 537 725 | 103 431 |
| 31 | 434 | 31 | ERA AVIATION | UNITED STATES | 441 969 | 141 385 |
| 32 | 485 | 32 | PENINSULA AIRWAYS | UNITED STATES | 286 257 | 189 450 |
| 33 | 490 | 33 | SEABORNE AIRLINES | UNITED STATES | 261 381 | 48 228 |
| 34 | 491 | 34 | Hageland Aviation | UNITED STATES | 258 109 | 42 493 |
| 35 | 495 | 35 | MOKULELE FLIGHT SERVICES | UNITED STATES | 245 907 | 29 478 |
| 36 | 496 | 36 | GRAND CANYON | UNITED STATES | 242 948 | 20 574 |
| 37 | 507 | 37 | EASTERN | UNITED STATES | 220 804 | 143 318 |
| 38 | 509 | 38 | Empire Airlines | UNITED STATES | 205 127 | 22 742 |
| 39 | 513 | 39 | BOUTIQUE AIR | UNITED STATES | 182 403 | 68 384 |
| 40 | 526 | 40 | MIAMI AIR INTERNATIONAL | UNITED STATES | 150 973 | 224 659 |
| 41 | 529 | 41 | World Atlantic Airlines | UNITED STATES | 141 656 | 239 569 |
| 42 | 537 | 42 | OMNI AIR EXPRESS | UNITED STATES | 127 233 | 608 143 |
| 43 | 546 | 43 | Contour Airlines | UNITED STATES | 107 038 | 57 285 |
| 44 | 551 | 44 | Grant Aviation | UNITED STATES | 103 002 | 12 699 |
| 45 | 555 | 45 | STAR MARIANAS AIR | UNITED STATES | 89 550 | 3 500 |
| 46 | 563 | 46 | AIR CHOICE ONE | UNITED STATES | 83 617 | 28 595 |
| 47 | 565 | 47 | BERING AIR | UNITED STATES | 82 121 | 15 753 |
| 48 | 570 | 48 | SUN AIR EXPRESS | UNITED STATES | 77 613 | 20 077 |
| 49 | 571 | 49 | Aerodynamics, Inc. | UNITED STATES | 77 487 | 43 358 |
| 50 | 573 | 50 | Delux Public Charter LLC | UNITED STATES | 73 982 | 33 936 |
| 51 | 574 | 51 | VOLUNTEER | UNITED STATES | 70 497 | 28 403 |
| 52 | 576 | 52 | DYNAMIC AIR | UNITED STATES | 69 023 | 274 163 |
| 53 | 580 | 53 | VIEQUES AIR LINK | UNITED STATES | 63 569 | 2 942 |
| 54 | 581 | 54 | KENMORE AIR | UNITED STATES | 63 549 | 5 481 |
| 55 | 584 | 55 | KALININ AVIATION | UNITED STATES | 61 889 | 6 727 |
| 56 | 586 | 56 | GREAT LAKES AIRLINES | UNITED STATES | 60 573 | 29 564 |
| 57 | 587 | 57 | ULTIMATE JETCHARTERS | UNITED STATES | 60 349 | 31 115 |
| 58 | 594 | 58 | AIR CHARTER | UNITED STATES | 53 052 | 2 409 |
| 59 | 595 | 59 | Elite Airways | UNITED STATES | 52 972 | 73 351 |
| 60 | 603 | 60 | TRADEWIND AVIATION | UNITED STATES | 45 301 | 15 388 |
| 61 | 604 | 61 | WRIGHT AIR LINES | UNITED STATES | 44 388 | 15 755 |
| 62 | 615 | 62 | WARBELOW | UNITED STATES | 32 989 | 9 152 |
| 63 | 616 | 63 | New England Airlines | UNITED STATES | 32 487 | 889 |
| 64 | 619 | 64 | PM AIR | UNITED STATES | 30 299 | 3 413 |
| 65 | 630 | 65 | SCOTT AIR | UNITED STATES | 21 114 | 1 916 |
| 66 | 631 | 66 | ISLAND AIR SERVICE | UNITED STATES | 20 805 | 1 568 |
| 67 | 632 | 67 | SMOKEY BAY AIR | UNITED STATES | 20 344 | 708 |
| 68 | 639 | 68 | Key Lime Air | UNITED STATES | 16 739 | 9 225 |
| 69 | 640 | 69 | CITY WINGS | UNITED STATES | 16 732 | 1 211 |
| 70 | 647 | 70 | PACIFIC AIRWAYS | UNITED STATES | 14 476 | 917 |
| 71 | 648 | 71 | RYAN INTL AIRLINES | UNITED STATES | 13 913 | 1 221 |
| 72 | 652 | 72 | KATMAI AIR | UNITED STATES | 12 723 | 1 114 |
| 73 | 653 | 73 | JET AVIATION FLIGHT SERVICES | UNITED STATES | 12 136 | 22 390 |
| 74 | 654 | 74 | ILIAMNA AIR TAXI | UNITED STATES | 11 758 | 3 705 |
| 75 | 655 | 75 | MAKANI KAI AIR | UNITED STATES | 10 812 | 563 |
| 76 | 657 | 76 | National Air Cargo | UNITED STATES | 9 912 | 20 251 |
| 77 | 659 | 77 | AIR SUNSHINE | UNITED STATES | 8 798 | 1 513 |
| 78 | 660 | 78 | AIR EXCURSIONS | UNITED STATES | 8 723 | 577 |
| 79 | 662 | 79 | Monarch Air | UNITED STATES | 8 452 | 2 784 |
| 80 | 669 | 80 | TRANS NORTHERN AIRWAYS | UNITED STATES | 7 173 | 3 271 |
| 81 | 671 | 81 | IBC AIRWAYS | UNITED STATES | 7 020 | 5 974 |
| 82 | 672 | 82 | Harris Aircraft Services | UNITED STATES | 6 777 | 872 |
| 83 | 673 | 83 | Flight Alaska a.k.a Yute Air | UNITED STATES | 6 060 | 457 |
| 84 | 675 | 84 | SPERNAK AIRWAYS | UNITED STATES | 5 871 | 414 |
| 85 | 681 | 85 | TATONDUK OUTFITTERS | UNITED STATES | 3 475 | 1 136 |
| 86 | 683 | 86 | TANANA AIR SERVICE | UNITED STATES | 2 647 | 237 |
| 87 | 684 | 87 | WEST ISLE AIR | UNITED STATES | 2 421 | 312 |
| 88 | 689 | 88 | ARCTIC TRANSPORTATION | UNITED STATES | 1 601 | 541 |
| 89 | 698 | 89 | 40-MILE AIR | UNITED STATES | 710 | 133 |
| 90 | 702 | 90 | Gem Air | UNITED STATES | 324 | 83 |
| 91 | 703 | 91 | ELLIS AIR | UNITED STATES | 321 | 51 |
| 92 | 706 | 92 | J&M Alaska Air Tours | UNITED STATES | 309 | 54 |
| 93 | 709 | 93 | NATIONAL AIRLINES | UNITED STATES | 276 | 888 |
| 94 | 710 | 94 | REEVE AIR ALASKA | UNITED STATES | 270 | 71 |
| 95 | 713 | 95 | Erickson Helicopters | UNITED STATES | 219 | 33 |
| 96 | 714 | 96 | Songbird Airways | UNITED STATES | 199 | 304 |
| 97 | 715 | 97 | GRAND CANYON HELICOPTERS | UNITED STATES | 188 | 18 |
| 98 | 717 | 98 | WARD AIR | UNITED STATES | 52 | 2 |
| USA total | 851 825 350 | 1 553 738 725 | ||||
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