| 1 | I9 | Air-Serv, Inc d/b/a Indigo | ICAO: IBU, Callsign: Indigo Blue, Designator I9* recalled by IATA. Name changed from Indigo | USA | AVCODES |
| 2 | I9 | Indigo | Designator I9* recalled by IATA | USA | AVCODES |
| 3 | I9 | Indigo | Designator I9* reinstated by IATA. Name changed to Air-Serv, Inc d/b/a Indigo | USA | AVCODES |
| 4 | I9 | Air Italy S.p.A. | ICAO: AJR, Callsign: Air Italy, ICAO Designator changed to AEY. Designator NN recalled by IATA | I | AVCODES |
| 5 | I9 | Air Italy S.p.A. | ICAO: AEY, Callsign: Air Italy, ICAO Designator changed from AJR. Designator I9* recalled by IATA. Designator NN recalled by IATA | I | AVCODES |
| 6 | I9 | Air Italy S.p.A. | ICAO: AEY, Callsign: Air Italy, IATA Prefix: 067, Ceased operation on 11 February 2020. Name changed to Air Italy Fleet Management, S.p.A. w.e.f. 01 March 2018. AOC returned on 01 March 2018. ICAO Designator changed from AJR. Designator I9* reinstated by IATA. Designator NN recalled by IATA | I | AVCODES |
| 7 | I9 | Air Italy S.p.A. | ICAO: AEY, Callsign: Air Italy, Merged into Meridiana fly on 18 July 2011. IATA Accounting code and Prefix code recalled. ICAO Designator changed from AJR. Designator I9* reinstated by IATA. Designator NN recalled by IATA | I | AVCODES |
| 8 | I9 | Central Airlines Co., Ltd. | ICAO: HLF, Callsign: Homeland, IATA Prefix: 959, Name changed from Homeland Airlines Co., Ltd. Also known as Zhongzhou Airlines. | PRC | AVCODES |
