Airline ceased operations, brand change, purchased, sold, merged and suspended operations in the world.
 

Air2000 - (Code IATA: DP, Code ICAO: AMM) United Kingdom, now operating as First Choice Airways.
Canadian Airlines - (Code IATA: CP) Canada, not operating.
Chalk's Ocean Airways - (Code IATA: OP) United States, purchased by Pan American Airways.
Cronus Air - (Code IATA: X5, Code ICAO: CUS) Greece, merged with Aegean to form Aegean Cronus Airlines.
DAT Delta Air Transport - operating with Sabena as SN Brussels.
Emery - (Code IATA: EB) United States, acquired by and now operating as Menlo Worldwide Forwarding.
Fine Air - (Code IATA: FB) United States, consolidated with Arrow Air.
HMY - (Code IATA: HQ) Canada, name changed MAY04 now operating as Harmony Airways.
Khalifa Airways - (Code IATA: K6, Code ICAO: KZW) Algeria, operations taken over by Air Littoral.
Reliant Airlines - (Code ICAO: RLT) not operating.
Sabena - (Code IATA: SN) operating with DAT as SN Brussels.
Skyway Airlines / Midwest Express Connection - (Code IATA: AL) brand change to Midwest Connect.
Swissair - (Code IATA: SR) stopped services.
TWA - (Code IATA: TW) United States, not operating.

Jetsgo -  (Code IATA: SG) Canada, ceased operations.

Air Botnia - (Code IATA: KF, Code ICAO: KFB) Finland, brand change.
Atlantic Coast Airlines ACA - (Code IATA: DH) United States now operating as Independence Air.
China Northern - (Code IATA: CJ, Code ICAO: CBF) acquired by China Southern Airlines Group.
CP Air - (Code IATA: CP) Canada, evolved into Canadian Airlines, purchased by Pacific Western Airlines operated as Canadian Airlines and purchased by Air Canada.

ACES - (Code IATA: VX) Colombia, ceased operations.
Aeris - (Code IATA: SH, Code ICAO: AIS) France, ceased operations.
Aero Lloyd - (Code IATA: YP, Code ICAO: AEF) Germany, ceased operations.
Air Anatolia - (Code IATA: TD, Code ICAO: NTL) Turkey, ceased operations.
Air Lib - (Code IATA: IJ, Code ICAO: LIB) France, not operating.
Berlin jet.com - Germany, ceased operations.
Crossair - (Code IATA: LX) merged with Swissair to form Swiss International Air Lines.
Euroceltic - (Code IATA: 5Q, Code ICAO: ECY) Ireland, ceased operations.
Midway Airlines - (Code IATA: JI) United States, purchased by Mesa Air Group.
Midwest Express Airlines - (Code IATA: YX) United States, brand change to Midwest Airlines.
North Vancouver Airlines - (Code IATA: VL, Code ICAO: NRV) brand change to Regency - North Vancouver Air.
Trans Travel Airlines - TTA - (Code IATA: 6N, Code ICAO: TRQ) stopped services.

Air Afrique - (Code IATA: RK)
Ansett - (Code IATA: AN) Australia, ceased operations.
Armenian Airlines - (Code IATA: R3) ceased operations.
Eastland Air - (Code IATA: DK, Code ICAO: ELA) Australia, ceased operations.
Flight West - (Code IATA: YC, Code ICAO: FWQ) Australia, changed name to Alliance Airlines.
Go Fly - (Code IATA: GO) United Kingdom, purchased by Easy Jet.
Hazelton Airlines - (Code IATA: ZL, Code ICAO: HZL) Australia, merged with Kendell Airlines to form Regional Express.
Kendell Airlines - (Code IATA: KD, Code ICAO: KDA) Australia, merged with Hazelton Airlines to form Regional Express.
National Airlines - (Code IATA: N7) United States, not operating.
Passaredo Transporte Aereos - (Code IATA: Y8) suspended services.
Pem-Air dba Trillium Air - (Code IATA: PD, Code ICAO: PEM) Canada, suspended by Canadian Transportation Agency.
The Qualiflyer Group (Global Alliance) - disbanded.
Vanguard - (Code IATA: NJ) United States, not operating.

Air Liberte - France, merged with AOM.
Antinea Airlines - (Code IATA: HO, Code ICAO: DJA) purchased by Khalifa.
AOM French Airlines - (Code IATA: IW, Code ICAO: AOM) France, merged with Air Liberte to form Air Lib.
Avant Airlines - (Code IATA: OT)
Base Airlines - (Code IATA: 5E, Code ICAO: BRO) Netherlands.
Binter Mediterraneo - (Code IATA: AX, Code ICAO: BIM) sold to Air Nostrum.
Cargo Lion - (Code ICAO: TLX) Luxembourg, ceased operations.
Citybird - (Code IATA: H2) ceased operations.
Galaxy Airways  - (Code IATA: 9G, Code ICAO: GLX) Greece, ceased operations.
Hellenic Star  - (Code ICAO: HST) Greece, ceased operations.
Impulse Airlines - (Code IATA: VQ, Code ICAO: QAA) Australia, ceased operations. Now operating within Qantas subsidiary QantasLink along with Airlink, Eastern Australian Airlines and Sunstate.
Muk Air - not operating.
Western Airlines - (Code IATA: EM) Australia, ceased operations.

Air Sask - (Code IATA: 7W) Canada, merged with Athabaska Airways.
Athabaska Airways - (Code IATA: 9T) Canada, merged with Air Sask to form Transwest Air.
British European - United Kingdom, evolved from Jersey European and re-launched as Flybe.
Jersey European - (Code IATA: JY, Code ICAO: JEA) United Kingdom, changed brand to British European and re-launched as Flybe.
Tower - (Code IATA: FF) United States, not operating.

Kiwi International Airlines - (Code IATA: KR) not operating.

Western NSW Airlines - (Code IATA: FO) Australia, ceased operations.

Pan Am - (Code IATA: PA) United States, stopped services, Guilford Transportation Industries of Billerica Massachusetts purchased the bankruptcy protected Pan Am and formed a re-structured Pan American Airways.

People Express - United States, acquired by Texas International.

Braniff International - (Code IATA: BN) United States, not operating.

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