| 1 | XP | T.E.M. Enterprises Inc. d/b/a Casino Express | ICAO: CXP, Callsign: Casino Express, Name changed to T.E.M. Enterprises Inc. d/b/a Xtra Airways. Founded in 1987. | USA | AVCODES |
| 2 | XP | DHL Aero Express, S.A. | ICAO: DAE, IAATA changed to DS | PA | AVCODES |
| 3 | XP | Avior Airlines Pty Ltd. | | AUS | AVCODES |
| 4 | XP | T.E.M. Enterprises Inc. d/b/a Xtra Airways | ICAO: CXP, Callsign: Ruby Mountain, Naem changed to T.E.M. Enterprises Inc. d/b/a Avelo Airlines. ICAO designator changed to VXP. Accounting code 615 recalled by IATA. Founded in 1987. Name changed from T.E.M. Enterprises Inc. d/b/a Casino Express | USA | AVCODES |
| 5 | XP | T.E.M. Enterprises Inc. d/b/a Avelo Airlines | ICAO: CXP, Callsign: Avelo, Name chanaged to T.E.M. Enterprises Inc. d/b/a Xtra Airways. ICAO designator changed to VXP. Founded in 1987. Name changed from T.E.M. Enterprises Inc. d/b/a Xtra Airways and previously T.E.M. Enterprises Inc. d/b/a Casino Express | USA | AVCODES |
| 6 | XP | T.E.M. Enterprises Inc. d/b/a Avelo Airlines | ICAO: VXP, Callsign: Avelo, Name chanaged to T.E.M. Enterprises Inc. d/b/a Xtra Airways. ICAO designator changed from CXP. Founded in 1987. Name changed from T.E.M. Enterprises Inc. d/b/a Xtra Airways and previously T.E.M. Enterprises Inc. d/b/a Casino Express | USA | AVCODES |
| 7 | XP | Xaver Pittrrich Bauunternehmung GmbH = Co KO | | DE | VKM |
| 8 | XPA | Pan Am Weather Systems | | USA | AVCODES |
| 9 | XPA | Pan Am Weather Systems | | | ICAO1 |
| 10 | XPAH | PORT AUTHORITY TRANS HUDSON (PATH, NY-NJ) | | | PWRC |
| 11 | XPAL | PORT AUTHORITY TRANSIT CORP. (PHILADELPHIA AREA) - LINDENWOLD NJ LINE | | | PWRC |
| 12 | XPAT | PORT AUTHORITY TRANSIT (PITTSBURGH - ALLEGHENY COUNTY) | | | PWRC |
| 13 | XPAU | EXPANSION SAS | | F | BIC |
| 14 | XPAU | EXPANSION SAS | | | SCAC4 |
| 15 | XPCU | SMA SOLAR TECHNOLOGY AG | | D | BIC |
| 16 | XPD | Expedition Airways | Callsign: Expedition, Designator FO* recalled by IATA | ZW | AVCODES |
| 17 | XPD | Expedition Airways | IATA: FO, Callsign: Expedition, Designator FO* recalled by IATA | ZW | AVCODES |
| 18 | XPDS | XPURT INDUSTRIAL COURIERS | | | SCAC4 |
| 19 | XPE | Amira Air GmbH | Callsign: Expert, Name changed to LaudaMotion GmbH. ICAO Desginator changed to LDM. | A | AVCODES |
| 20 | XPE | Amira Air | | | ICAO1 |
| 21 | XPEA | XPERTFREIGHT | | | SCAC4 |
| 22 | XPED | XPEDX (DIV OF INTERNATIONAL PAPER C | | | SCAC4 |
| 23 | XPEDYS | Xpedys | Subsidiary of B-Cargo founded in 2003 | B | TRAFFIC |
| 24 | XPEL | XPERTS LOGISTICS | | | SCAC4 |
| 25 | XPEP | XPEDX (DIV OF INTERNATIONAL PAPER P | | | SCAC4 |
| 26 | XPER | XPERT TRANSPORTATION LLC | | | SCAC4 |
| 27 | XPET | XTRA PETROLEUM TRANSPORT INC | | | SCAC4 |
| 28 | XPFW | XPRESS CANADA | | | SCAC4 |
| 29 | XPG | Southport Aerospace Centre | | CDN | AVCODES |
| 30 | XPG | Southport Air Service | | | ICAO1 |
| 31 | XPIF | Pool Ibérico Ferroviario | | E | TRAFFIC |
| 32 | XPL | Express Line Aircompany | | | ICAO1 |
| 33 | XPLO | XPRESS LOGISTICS LLC | | | SCAC4 |
| 34 | XPMZ | (PRMU) PUERTO RICAN MARITIME SHIPPING AUTHORITY | | | PWRC |
| 35 | XPMZ | Puerto Rican Maritime Shipping Authority | | | RSRV |
| 36 | XPMZ | PUERTO RICAN MARITIME SHIPPING AUTH | | | SCAC4 |
| 37 | XPN | Aero Express | | RN | AVCODES |
| 38 | XPOU | XPO LOGISTICS | | USA | BIC |
| 39 | XPR | Air-Rep | | USA | AVCODES |
| 40 | XPR | Air-Rep | | | ICAO1 |
| 41 | XPRC | XPRESS CARGO INC | | | SCAC4 |
| 42 | XPRD | XPRESS TRANSPORTATION INC | | | SCAC4 |
| 43 | XPRF | XPRESS FUELS LLC | | | SCAC4 |
| 44 | XPRS | XPRESS TRUCKING INC | | | SCAC4 |
| 45 | XPRV | XPRESS CARGO INC (RAIL DIVISON) | | | SCAC4 |
| 46 | XPS | XP International BV | IATA: OH, Callsign: XP Parcel, Ceased operations. Designator OH recalled by IATA | NL | AVCODES |
| 47 | XPS | XP Internation | | | ICAO1 |
| 48 | XPS | XPEDYS | | BE | VKM |
| 49 | XPSC | PORT OF SEATTLE COMM. - SEATTLE TACOMA INTERNATIONAL AIRPORT | | | PWRC |
| 50 | XPSI | XPRESS SOLUTIONS INC | | | SCAC4 |
| 51 | XPST | X-PORT SERVICES INC | | | SCAC4 |
| 52 | XPSV | XP SERVICES | | | SCAC4 |
| 53 | XPTC | XPRESS FREIGHT SERVICES INC | | | SCAC4 |
| 54 | XPTG | XPRESS TRUCKING | | | SCAC1 |
| 55 | XPTG | XPRESS TRUCKING | | | SCAC4 |
| 56 | XPTK | X PLUS TRUCKING INC | | | SCAC4 |
| 57 | XPTP | X-PRO TRANSPORTATIONS | | | SCAC4 |
| 58 | XPTT | XACT PATTERN & FIXTURES INC | | | SCAC4 |
| 59 | XPUS | XENOPUS INC | | | SCAC4 |
| 60 | XPWX | Expressway | 7/2000-7/2005 (not listed) | | NAKINA |
| 61 | XPWX | Expressway | Jul-00 | | NRHS |
| 62 | XPWX | CANADIAN PACIFIC (EXPRESSWAY) | | | PWRC |
| 63 | XPWX | Canadian Pacific Railway | | | RSRV |
| 64 | XPWX | EXPRESSWAY | | | SCAC4 |
| 65 | XPWY | XPRESSW | | | SCAC4 |
| 66 | XPX | Phoenix Flight Operations Ltd. | | CDN | AVCODES |
| 67 | XPX | Phoenix Flight Operations | | | ICAO1 |
| 68 | XPXN | XPEAK LOGISTICS LLC | | | SCAC4 |
| 69 | XPXP | XPORT XPRESS COMPANY INC | | | SCAC4 |
| 70 | XPXS | XPERT XPRESS INC | | | SCAC4 |
