| 1 | 1A | Amadeus Global Travel Distribution, S.A. | ICAO: AGT, Changed from Amadeus Marketing S.A. Name changed to Amadeus IT Group SA. Computer Reservation System | E | AVCODES |
| 2 | 1A | Amadeus Marketing, S.A. | ICAO: AGT, Changed to Amadeus Global Travel Distribution S.A. Computer Reservation System | E | AVCODES |
| 3 | 1A | Amadeus IT Group SA. | ICAO: AGT, Callsign: Amadeus, Changed from Amadeus Marketing S.A. Name changed from Amadeus Global Travel Distribution, S.A. Computer Reservation System | E | AVCODES |
| 4 | 1B | Abacus International Pte. Ltd. | Name changed to Sabre Asia Pacific Pte. Ltd. Computer Reservation System | SGP | AVCODES |
| 5 | 1B | Sabre Asia Pacific Pte. Ltd. | Name changed from Abacus International Pte. Ltd. Computer Reservation System | SGP | AVCODES |
| 6 | 1C | Galileo Canada Distribution Systems, Inc. | Computer Reservation System | CDN | AVCODES |
| 7 | 1C | EDS Information Business GmbH | Name changed to Hewlett-Packard (Schweiz) GmbH. Computer Reservation System | CH | AVCODES |
| 8 | 1C | Hewlett-Packard (Schweiz) GmbH | Name changed from EDS Information Business GmbH. Computer Reservation System | CH | AVCODES |
| 9 | 1C | A-ICE S.r.l. | Computer Reservation System | I | AVCODES |
| 10 | 1D | Radixx Solutions International, Inc. | Computer Reservation System | USA | AVCODES |
| 11 | 1E | Travelsky Technology Limited | Name changed from Management Information System - Civil Aviation Administration of China. Computer Reservation System | PRC | AVCODES |
| 12 | 1F | INFINI Travel Information, Inc. | Computer Reservation System | J | AVCODES |
| 13 | 1G | Galileo International LLC | Name changed to Travelport Global Distribution System B.V. Computer Reservation System | USA | AVCODES |
| 14 | 1G | Travelport Global Distribution System B.V. | Name changed from Galileo International LLC. Computer Reservation System | USA | AVCODES |
| 15 | 1G | Travelport d/b/a Worldspan | Name changed from Travelport Global Distribution System B.V. Computer Reservation System | USA | AVCODES |
| 16 | 1H | Islena de Inversiones S.A. de C.V. d/b/a Islena Airlines | ICAO: ISV, IATA designator changed to WC. Founded in 1981. Commenced operations on 31 March 1981. | HN | AVCODES |
| 17 | 1H | Comtech-N, JSC | Name changed to Siren-Travel Closed Joint Stock Company. Computer Reservation System | RUS | AVCODES |
| 18 | 1H | Advantis | Designator 1H recalled by IATA. Computer Reservation System | CDN | AVCODES |
| 19 | 1H | Siren-Travel Closed Joint Stock Company | Name changed from Comtech-N, JSC. Computer Reservation System | RUS | AVCODES |
| 20 | 1I | Pegasus Hava Tasimaciligi A.S. | ICAO: PGT, Callsign: Sunturk, IATA designator changed to H9* | TR | AVCODES |
| 21 | 1I | Nova Airlines AB | ICAO: NVR, Callsign: Navigator, IATA designator changed to N9* | S | AVCODES |
| 22 | 1I | Executive Jet Aviation, Inc. | ICAO: EJA, Callsign: Execjet, Name changed to Netjets Aviation, Inc. | USA | AVCODES |
| 23 | 1I | Sky Trek International Airlines | ICAO: PZR, Callsign: Phazer, Commenced operations in 1996. Ceased operations in 2000. | USA | AVCODES |
| 24 | 1I | Ryan International Airlines | ICAO: RYN, Callsign: Ryan International, IATA Designator changed to RD | USA | AVCODES |
| 25 | 1I | Sierra Nevada Airways | | USA | AVCODES |
| 26 | 1I | Deutsche Rettungsflugwacht | ICAO: AMB, Callsign: Civil Air Ambulance, Name changed to DRF - Stiftung Luftrettung Gemeinnuetzige AG. Previously used IATA code DV | D | AVCODES |
| 27 | 1I | MD Flugfelagid EHF (MD Airlines Ltd.) | ICAO: MDI, Callsign: Delta Ice, IATA designator changed to W3 | IS | AVCODES |
| 28 | 1I | Volare Airtransport Joint-Stock Company | ICAO: VRE, IATA designator changed to F7* | RUS | AVCODES |
| 29 | 1I | Edelweiss Air AG | ICAO: EDW, Callsign: Edelweiss, IATA designator changed to XE | CH | AVCODES |
| 30 | 1I | Blue Panorama Airlines S.p.A. | ICAO: BPA, Callsign: Blue Jet, IATA designator changed to 9S | I | AVCODES |
| 31 | 1I | Montenegro Airlines | ICAO: MGX, Callsign: Montair, IATA designator changed to YM | YU | AVCODES |
| 32 | 1I | Omni Air International, Inc. d/b/a Omni Air Express | ICAO: OAE, Callsign: Omni-Express, IATA Designator changed to OY* | USA | AVCODES |
| 33 | 1I | Edelweiss Air AG | ICAO: EDW, Callsign: Edelweiss, IATA desigantor changed to 5H* | CH | AVCODES |
| 34 | 1I | ChallengAir | ICAO: CHG, Callsign: Belgochallenge, | B | AVCODES |
| 35 | 1I | Netjets Aviation, Inc. | ICAO: EJA, Callsign: Execjet, Name changed from Executive Jet Aviation, Inc. | USA | AVCODES |
| 36 | 1J | Axess International Network, Inc. | Computer Reservation System. Designator 1J recalled by IATA. | J | AVCODES |
| 37 | 1K | Southern Cross Distribution Systems | Computer Reservation System | AUS | AVCODES |
| 38 | 1K | Sutra, Inc. | Computer Reservation System | USA | AVCODES |
| 39 | 1K | Sutra Inc | Computer Reservation System | CDN | AVCODES |
| 40 | 1L | Open Skies, Inc. | Name changed to Navitaire Open Skies. Computer Reservation System | USA | AVCODES |
| 41 | 1L | Navitaire Open Skies | Name changed from Open Skies, Inc. Computer Reservation System | USA | AVCODES |
| 42 | 1L | CitizenPlane | Computer Reservation System | F | AVCODES |
| 43 | 1N | Navitaire | Name changed from Via World Network. Computer Reservation System | USA | AVCODES |
| 44 | 1N | Via World Network | Name changed to Navitaire. Computer Reservation System | USA | AVCODES |
| 45 | 1P | WorldSpan | ICAO: WSP, Computer Reservation System | USA | AVCODES |
| 46 | 1P | Travelport d/b/a WorldSpan | ICAO: WSP, Computer Reservation System | USA | AVCODES |
| 47 | 1Q | Joint-Stock Company International Technological Corp. Sirena | Designator 1Q reinstated by IATA | RUS | AVCODES |
| 48 | 1Q | Indigo Treks LLC | Computer Reservations Systems (CRS) | USA | AVCODES |
| 49 | 1Q | InteliSys Aviation Systems (2013) Inc | Computer Reservations Systems (CRS) | CDN | AVCODES |
| 50 | 1R | Hainan Phoenix Information Systems Ltd. | Computer Reservation System | PRC | AVCODES |
| 51 | 1R | Bird Information Systems Private | Computer Reservation System | IND | AVCODES |
| 52 | 1R | JR Technologies Ireland | | IRL | AVCODES |
| 53 | 1S | Sabre, Inc. | ICAO: SBG, IATA designator changed from 1W. Computer Reservation System | USA | AVCODES |
| 54 | 1S | Amadeus System One | Designator 1S recalled by IATA. Computer Reservation System | USA | AVCODES |
| 55 | 1T | T.I.A.S. Pty Ltd. | Computer Reservation System | AUS | AVCODES |
| 56 | 1T | 1Time Airline (Pty) Ltd | ICAO: RNX, Callsign: Next Time, IATA designator changed to T6. | ZA | AVCODES |
| 57 | 1T | PT Aerosystems Indonesia | | RI | AVCODES |
| 58 | 1T | Hitit Bilgisayar Hizmetleri A.S. | Computer Reservation System | TR | AVCODES |
| 59 | 1U | Polyot Sirena | Designator 1U reinstated by IATA. Computer Reservation System | RUS | AVCODES |
| 60 | 1U | ITA Software, Inc. | Computer Reservation System | USA | AVCODES |
| 61 | 1V | Galileo International | Name changed to Travelport d/b/a Galileo International. Computer Reservation System | USA | AVCODES |
| 62 | 1V | Travelport d/b/a Galileo International | Name changed from Galileo International. Computer Reservation System | USA | AVCODES |
| 63 | 1W | Sabre, Inc. | Name changed from SABRE Travel Information Network (a division of SABRE Group, Inc.). Computer Reservation System | USA | AVCODES |
| 64 | 1W | CTW Consulting | Computer Reservation System | CDN | AVCODES |
| 65 | 1X | Fly Branson Travel d/b/a Branson Air Express | Computer Reservations Systems (CRS) | USA | AVCODES |
| 66 | 1Y | Electronic Data Systems Corporation | Merged with Computer Sciences Corporation to from DXC Technology Services LLC. Computer Reservation System | USA | AVCODES |
| 67 | 1Y | DXC Technology Services LLC | Formed by the merger of Electronic Data Systems Corporation and Computer Sciences Corporation. Computer Reservation System | USA | AVCODES |
| 68 | 1Z | Sabre Pacific | ICAO: APD, Designator 1Z reinstated by IATA. Computer Reservation System | AUS | AVCODES |
| 69 | 1Z | Bird Information Systems Private Limited | Computer Reservation System | IND | AVCODES |
