Airlines I've flown... I think they have all ceased public commercial passenger flights. I exclude cases where names change, or there is some sort of bankruptcy-phoenix
Adria Airways -JP, AeroPeru - AP, Aerro Direkt, Aigle Azur - ZI, Air Berlin - AB, Air Italy - IG, Air Leap - FL, Air Moldova - 9U, Air Ocean, Air UK, Air Vallee - VK, Airwing, Alitalia - AZ, Alitalia Cityliner - AZ, Anisec - VK, Atlas Global - KK, Atlas Global Ukraine - UH, Austral - AR, Avies - U3, Azur Air Ukraine - QU, Bees - 7B, Belair - 4T, Bergen Air Transport, Blue Air - 0B, Blue Panorama - BV, Blue1, bmi - BD, bmi Regional, bmibaby - WW, BWIA - BW, Cimber, Cobaltair - CO, Comair, Cyprus Airways - CY, Darwin - F7, Ernest Air - EG, Estonian Air - OV, European Coastal - CC/WL, Eurowings Europe (Austria), FLM Aviation, Flybe v1 + v2, Flybe Finland, FlyBosnia - 6W, FlyCompass - F6, Flyr - FS, FlyViking - VF, GB Airways, Germania - ST, Germanwings - 4U, Gowair - PU, Great Dane - DW, Gullivair - G2, Hahn Air - HR, Hex Air - UD, IZair, Jet Airways - 9W, Jet Time, Jetlite - S2, Joon, Jota Aviation, Kingfisher - IT, Ladeco, Laudamotion, Leisure One Fly, Links Air, Lipican Aer, Luftfahrgesellschaft Walter, Lyddair, Malta Med Air - MT, Meridiana - IG, Miami Air, Minoan Air, Mistral Air, Monarch - ZB, Montenegro Air - YM, MyWay - MJ, Naysa - NT, NextJet - 2N, Niki - HG, Odesa State Air - 5K, OLT Express, One Airways - OX, Orange2Fly, Primera Air Scandinavia - PF, PrivatAir, Privateways, S Air, SAS Ireland, SHS Antwerp, SiAvia, SkyTaxi - TE, Skywork - SX, Small Planet - S5, Small Planet Poland - 5P, South African Airlink, Stobart Air, Suckling, Tayaran Jet, Thomas Cook UK - MT, Thomas Cook Balearics, Thomas Cook Belgium - HQ, Tikal Jets, Transaero - UN, Tyrolean, Varig - RG, Virgin Express, VLM - VG, VLM Slovenia, Wizz Ukraine - WU, WOW Air - WW, XL France - SE