| 3401 | WOLZ | H. O. WOLDING, INC. | | | PWRC |
| 3402 | WOLZ | H. O. Wolding | | | RSRV |
| 3403 | WOLZ | H O WOLDING INC | | | SCAC4 |
| 3404 | WOMA | WOMAR LOGISTICS PTE LTD | | | SCAC4 |
| 3405 | WOMK | WOMACK TRANSPORTATION LLC | | | SCAC4 |
| 3406 | WON | Juan Air (1979) Ltd. | Callsign: Juan Air, | CDN | AVCODES |
| 3407 | WON | Wings Abadi Airlines, PT. | IATA: IW, Callsign: Wings Abadi, Commenced operations on 10 July 2003. Wholly owned subsidiary of Lion Air | RI | AVCODES |
| 3408 | WON | Wings Air | IATA: 1W | | ICAO1 |
| 3409 | WONF | WONG FRANCO, RICARDO | | | SCAC4 |
| 3410 | WONS | WONG, SAM & SON INC | | | SCAC4 |
| 3411 | WOOB | WOODLAND OIL INC | | | SCAC4 |
| 3412 | WOOD | WOOD, J R CORPORATION | | | SCAC4 |
| 3413 | WOOE | WOOTEN OIL COMPANY INC | | | SCAC4 |
| 3414 | WOOI | WOODSON TRUCKING INC | | | SCAC4 |
| 3415 | WOON | WOOD OIL COMPANY | | | SCAC4 |
| 3416 | WOOO | WOODRIDGE TRANSPORT INC | | | SCAC4 |
| 3417 | WOOP | WOOD, FRANK TRANSPORTATION INC | | | SCAC4 |
| 3418 | WOOT | WOODLAND TRUCK LINE, INC | | | SCAC1 |
| 3419 | WOOT | WOODLAND TRUCK LINE INC | | | SCAC4 |
| 3420 | WOOT | Woottens Luxury Travel | | GB | TRAFFIC |
| 3421 | WOOW | WOODLAWN OIL COMPANY INC | | | SCAC4 |
| 3422 | WOP | Scanaviation AS | Callsign: Woodpecker, | N | AVCODES |
| 3423 | WOR | WESTERN OHIO RAILROAD CO. | | | PWRC |
| 3424 | WORB | WOOD, ROBBIE D INC | | | SCAC4 |
| 3425 | WORI | WORLDWIDE | | | SCAC4 |
| 3426 | WORL | WORLD TRANSPORTATION SERVICE LLC | | | SCAC4 |
| 3427 | WORN | WORLD TRANSLOAD AND LOGISTICS LLC | | | SCAC4 |
| 3428 | WORS | WORLD SALES INC | | | SCAC4 |
| 3429 | WOSA | WW OILFIELD SERVICES LLC | | | SCAC4 |
| 3430 | WOSE | WESTCO | | | SCAC4 |
| 3431 | WOSH | WORLD SHIPPING INC | | | SCAC4 |
| 3432 | WOSI | WRIGHTS OIL SERVICE INC | | | SCAC4 |
| 3433 | WOSL | WOOSLEY, LORAN H | | | SCAC4 |
| 3434 | WOSN | WESTAR MOVING & STORAGE INC | | | SCAC4 |
| 3435 | WOSQ | WOOSTER MOTOR WAYS, INC | | | SCAC1 |
| 3436 | WOSU | WEST OCEAN SHIPPING COMPANY LIMITED | | HK | BIC |
| 3437 | WOT | Walton-on-Thames Motor Co. Ltd. | | GB | TRAFFIC |
| 3438 | WOTC | WHITE OAK TRANSPORTATION INC | | | SCAC4 |
| 3439 | WOTD | WORLD TRADE DISTRIBUTION INC | | | SCAC4 |
| 3440 | WOTK | WOOTEN TRUCKING | | | SCAC4 |
| 3441 | WOTM | WESTERN OHIO TRANSPORT LLC | | | SCAC4 |
| 3442 | WOTO | WILLIS, O. L | | | SCAC1 |
| 3443 | WOTP | WOODLAND TRANSPORT LLC | | | SCAC4 |
| 3444 | WOTZER | Wötzer Reisen | City: Grän | A | TRAFFIC |
| 3445 | WOV | Warren & Ouachita Valley Ry. Co. | 1/1975-1/1980; eliminated 10/1980 | | NAKINA |
| 3446 | WOV | Warren & Ouachita Valley Ry. Co. | 1/75-1/80; eliminated 10/80 | | NRHS |
| 3447 | WOV | WARREN & OUACHITA VALLEY RWY. CO. | | | PWRC |
| 3448 | WOV | Warren & Ouachita Valley Ry. Co. | | USA | TRAFFIC |
| 3449 | WOVT | WOLVERINE FREIGHT SYSTEM | | | SCAC1 |
| 3450 | WOVT | WOLVERINE FREIGHT SYSTEM | | | SCAC4 |
| 3451 | WOW | Air Southwest Ltd. | IATA: SZ, Callsign: Swallow, IATA Prefix: 429, Air Southwest was a British airline founded by Sutton Harbour Holdings in 2003. Ownership was transferred to Eastern Airways in September 2010 but operations ceased 12 months later on 30 September 2011. | GB | AVCODES |
| 3452 | WOW | Wow Air ehf | IATA: WW, Callsign: Wowair, IATA Prefix: 377, Ceased operations on 28 March 2019. | IS | AVCODES |
| 3453 | WOW | Air Southwest | | | ICAO1 |
| 3454 | WOWH | WORLD OF WHEELS | | | SCAC4 |
| 3455 | WOWK | WOWK, MILES | | | SCAC4 |
| 3456 | WOWP | WADE ODELL WADE PADDED VAN | | | SCAC4 |
| 3457 | WOWT | WOW TRANSPORTATION CORP | | | SCAC4 |
| 3458 | WOWV | WOW-FREIGHT SERVICES DIVISION | | | SCAC4 |
| 3459 | WOWX | Wilburine Oil Works, Ltd. | 8/1920-7/1923 | | NAKINA |
| 3460 | WOWX | Valvoline Oil Co. (Warren Refinery) | 7/1930 | | NAKINA |
| 3461 | WOWX | VALVOLINE OIL CO., WARREN REFINERY [WILBURINE OIL WORKS, LTD.] | | | PWRC |
| 3462 | WOX | Warren Oil Co. of Pennsylvania | 8/1920 | | NAKINA |
| 3463 | WOX | Warden Oil Co. | 7/1932-1/1943; 1/1945 (not listed) | | NAKINA |
| 3464 | WOX | General American Transportation Corp. | 1/1950-1/1952; eliminated 10/1953 | | NAKINA |
| 3465 | WOX | Warden Oil Co. | Apr-38 | | NRHS |
| 3466 | WOX | General American Transportation Corp. | 1/52; eliminated 10/53 | | NRHS |
| 3467 | WOX | *WARREN OIL CO. OF PENNSYLVANIA | | | PWRC |
| 3468 | WOX | *WARDEN OIL CO. | | | PWRC |
| 3469 | WOX | *GENERAL AMERICAN TRANSPORTATION CORP. | | | PWRC |
| 3470 | WOXL | WEBB ONE XPRESS L L C | | | SCAC4 |
| 3471 | WP | Aloha Islandair, Inc. | ICAO: PRI, IATA Prefix: 347, Name changed to Hawaii Island Air. Inc d/b/a Island Air w.e.f. 11 May 2004. | USA | AVCODES |
| 3472 | WP | Hawaii Island Air. Inc d/b/a Island Air | ICAO: MKU, Callsign: Moku, Ceased operations on 11 November 2017. Name changed from Aloha Islandair, Inc. w.e.f. 11 May 2004. | USA | AVCODES |
| 3473 | WP | Compania Aeronaves Del Peru, S.A. | | PE | AVCODES |
| 3474 | WP | Wasaya Airways L.P. | ICAO: WSG, Callsign: Wasaya, Designator WT recalled by IATA. IATA designator changed from WG*. Name changed from Wasaya Airways Ltd. | CDN | AVCODES |
| 3475 | WP | Air Antwerp | ICAO: ATW, Callsign: Devil, Ceased operations on 12 June 2021. | B | AVCODES |
| 3476 | WP | Western Pacific R.R. Co. | 7/1965-1/1980; eliminated 10/1987 | | NAKINA |
| 3477 | WP | Union Pacific R.R. Co. | added 10/1987; 1/1994-7/2005 | | NAKINA |
| 3478 | WP | Western Pacific R.R. Co. | 7/65-1/80; eliminated 10/87 | | NRHS |
| 3479 | WP | Union Pacific R.R. Co. | added 10/87; 1/94-7/2000 | | NRHS |
| 3480 | WP | UNION PACIFIC RAILROAD CO. [WESTERN PACIFIC RR] | | | PWRC |
| 3481 | WP | Western Pacific Railroad (Union Pacific Railroad) | | | RSRV |
| 3482 | WP | Western Pacific | | USA | TRAFFIC |
| 3483 | WP&Y | WHITE PASS AND YUKON CORPORATION, LTD. | | | PWRC |
| 3484 | WPA | Western Pacific Airservice | Callsign: Westpac, | SOL | AVCODES |
| 3485 | WPA | Western Pacific Airservice | | | ICAO1 |
| 3486 | WPAC | WESTPAC INTERNATIONAL LLC | | | SCAC4 |
| 3487 | WPAE | W P PRODUCE CORP | | | SCAC4 |
| 3488 | WPAI | WOLVERINE PACKING CO | | | SCAC4 |
| 3489 | WPAK | WATERLINK PAKISTAN (PVT) LTD | | | SCAC4 |
| 3490 | WPAO | WEST PAK AVOCADO INC | | | SCAC4 |
| 3491 | WPAP | WHITE PIGEON AUTOTRANSPORT CORP | | | SCAC4 |
| 3492 | WPAZ | WRIGHT PATTERSON AIR FORCE BASE | | | PWRC |
| 3493 | WPC | Commandair C.A. | Callsign: Command Air, | YV | AVCODES |
| 3494 | WPCA | WORLD PETROLEUM CORPORATION | | | SCAC4 |
| 3495 | WPCB | WESTRON PUMPS COMPRESSORS & BLOWERS | | | SCAC4 |
| 3496 | WPCL | WESTERN PETROLEUM CO INC | | | SCAC4 |
| 3497 | WPCN | WORLDWIDE PROCUREMENT COMPANY INC | | | SCAC4 |
| 3498 | WPCO | WITHUS TRANSPORTATION CORPORATION | | | SCAC4 |
| 3499 | WPCT | WRIGHT, PC TRUCKING LLC | | | SCAC4 |
| 3500 | WPCW | WENATCHEE PETROLEUM CO | | | SCAC4 |
