The definition of "obsolete" is quite loose, and more information is better than less, so even if it's borderline obsolete, it is welcome here. Generally for an aircraft to be considered obsolete, it should be out of production, and also not in widespread use.

Airbus A300
https://en.wikipedia.org/wiki/Airbus_A300
Produced 1971–2007
https://en.wikipedia.org/wiki/List_o...A300_operators

• Iran Air - Still has 8 of various varieties. Used on medium-haul routes
• Mahan Air (Iran) - Used on Iranian domestic flights
• Qeshm Air (Iran) - Used on flights from Tehran to Turkey

Airbus A310

• Mahan Air (Iran) - Medium-haul flights from Tehran base
• Ariana Afghan Airlines
• Taban Air
• Yemenia (Not convinced this airline is actually flying)

Antonov An-24

• Motor Sich Airlines (UA) (Ukraine) domestic flights have resumed on a small scale despite COVID-19 ...
• Polar Airlines (RU)
• KhabAvia (RU)
• IrAero (RU)
• Angara Air (RU)

Antonov AN-140

• Motor Sich Airlines (UA) (Ukraine) Flights with AN-140 are expected to resume on 15 sep 2020 on the OZH (Zaporizhiya, Ukraine) - MSQ (Minsk, Belorussia) route but may be moved/rescheduled at short notice depending on Covid-19 development.

Beechcraft 1900

• Air Sunshine (USA) - Based in San Juan Luis Muńoz Marín International Airport, flies interisland flights
• Buddha Air (Nepal)- various including Mount Everest sightseeing flights
• EVAS Air (Canada) - 6 aircraft operate for Air Canada Express in the maritimes
• Pacific Coastal Airlines (Canada) - 14 aircraft operating in British Columbia
• Twin Jet (France) - 12 aircraft flying in France and to neighboring countries
• Chalair Aviation (France) - a few flying in SW France - see the map at the bottom of the link
• Wasaya Airways (Canada) - Flights all over Ontario out of Sioux Lookout (YXL)
• PAL Airlines (Canada) - Flights in eastern Quebec
• Overland Airways (Nigeria) - Domestic Flights and to neighboring countries

Britten-Norman Islander (Technically still in production despite zero aircraft deliveries for years)

• Cape Air (USA) - Operates seasonal interisland flights out of San Juan Luis Muńoz Marín International Airport
• InterCaribbean Airways (Turks and Caicos) - Flies interisland flights
• Air Flamenco (USA) - Culebra Puerto Rico based carrier connecting Culebra to other parts of Puerto Rico, and the Caribbean
• Loganair (Scotland)- intraisland routes ex Kirkwall (KOI)
• Air Vanuatu - domestic flights
• Fly Montserrat - Flights to Antigua and Barbuda
• Anguilla Air Services - All flights
• Air Panama - domestic flights to eastern Panama
• FlyMySky (New Zealand)- service ex AKL to great barrier island and Matamata (Hobbiton?)

Britten-Norman Trislander

• Vieques Air Link (USA) - Vieques Puerto Rico based carrier connecting Vieques and Culebra to the rest of Puerto Rico
• Roraima Airways (Guyana) - Guyanese regional airline operating domestic flights.

Boeing 727
Zero G (USA) - A weightlessness experience - Costs $5400 per person.

Cessna 402

• Cape Air (USA) - Backbone of their fleet, operates various leisure routes in New England, and the Caribbean. Also operates EAS contract flights in the midwest.
• Chartair (Australia)- regional milk run routes in NT/WA/SA

Dornier 228

• Sevenair (Portugal) - domestic hops
• Aurigny Air (UK) - flights to the Channel Islands
• Air Marshall Islands - interisland flights
• Tara Air (Nepal) - domestic flights
• NCA New Central Air (Japan) - domestic flights in Japan from Tokyo-Chofu airport to various Islands off Tokyo coast (so-called Izu Islands). Operates a mix of older Do228-200 and Do228NG (!). TheBN2A Islanders are only used as back-up and for charter nowadays.

Dornier 328
Central Mountain Air (Canada) - flights in Alberta and British Columbia

Dornier Do328JET

• Denver Air Connection (USA) - DEN-TEX - One roundtrip flight daily (not possible for day trip), Operates daily until ~June where it operates Saturdays only.
• Taos Air (USA) - Seasonal flights to Taos, NM for ski resort
• Sun-Air of Scandinavia (Denmark and several nearby countries, British Airways franchisee) - flying 16 328JETs on several routes, mostly out of BLL (Billund, DK), including LCY-BLL, MAN-BLL, OSL-BLL, AAR-BMA.

Embraer 110

• CM Airlines (Honduras) - domestic flights and to neighboring countries
• TAG Airlines (Guatemala) - domestic flights
• Air Rarotonga (Cook Islands) - Flights between Rarotonga and Aitutaki

Embraer 120

• InterCaribbean Airways (Turks and Caicos) - Flies interisland flights
• Airnorth (Australia)- regional routes in NT/WA
• Mahogany Air (Zambia) - more information needed
• Freedom Airline (Kenya) - domestic and flights to Somalia
• LAM (Mozambique) - domestic flights
• Skippers (Australia) - flights around WA (2023- believe this is now not happening and remaining aircraft transferred to airnorth- pending verification)
• African Express (Kenya) - domestic flights
• Transair (Senegal) - domestic flights

Fokker 50

• Air Panama (Panama)
• Braathens (Sweden) - domestic routes, operated by Amapola
• Skyward Express (Kenya) - domestic routes
• Air Antwerp (Belgium) - Antwerp to LCY

Fokker 70

• Air Niugini (New Guinea) - Operates in Oceania, with destinations including Australia
• Alliance Airlines (Australia) - Flights in Queensland and WA
• Virgin Australia - Short-haul flights from BNE

Fokker 100

• Air Niugini (New Guinea) - Operates in Oceania, with destinations including Australia
• QantasLink (network aviation) Australia- operates regional routes in WA and NT
• Virgin Australia- operates regional routes in NT, SA and WA. Being retired
• Alliance Airlines (Australia)- operates regional routes in QLD/NT, some operate on behalf of Virgin Australia
• Iran Air - domestic routes
• Qeshm Air (Iran) - domestic routes
• Iran Aseman Air - domestic routes
• Trade Air (Croatia) - domestic flights

Jetstream 31

• FlyPelican (Australia)- regional and metro commuter flights east coast Australia

Ilyushin IL96
Cubana (Cuba) - Operates on transatlantic flights - Suspended

Let 410

• Skyway (Costa Rica) - domestic flights
• Eagle Air (Uganda) - flights between Arua and Entebbe
• Krasavia (Russia) - flights around Siberia
• Oren Airline (Russia) - flights in central Russia

Saab 340B

• Pacific Coastal Airlines (Canada) - Operates fleet of 340A and B aircraft within British Columbia. Also operates as WestJet Link throughout BC/AB.
• Regional Express (REX) (Australia)- regional flights just about everywhere- QLD, WA, SA, NSW. Possibly others
• Loganair (Scotland)- regional flights in Highlands and islands
• Air Rarotonga (Cook Islands) - multiple destinations inc Tahiti (PPT)
• Link Airways (Australia) - metropolitan and regional destinations in East Coast Australia
• Air Chathams (New Zealand) - multiple destinations inc Norfolk Island

Swearingen/Fairchild Metroliner

• Denver Air Connection (USA) - DEN-AIA - One roundtrip flight daily (not possible for day trip), half of the seats have been removed to bring it down to 9 seats for EAS service.
• Air Chathams (New Zealand) - Acccording to their website (Fairchild Metroliner), these are flown between Auckland (AKL) and Whakatane (WHK)
• FlyTiwi (Australia)- regional routes in NT
• Murin Air (Australia)- Darwin to Wadeye route (NT)
• Sharp Aviation (Australia)- regional routes Vic/Tas/?NSW
• Bearskin Airlines (Canada) - Bearskin (JV) still operates 23 Metroliners on flights around Ontario, primarily from their bases at Thunder Bay (YQT) and Sioux Lookout (YXL)
• Skippers aviation (Australia)- regional routes in WA

Yakovlev Yak-40
Motor Sich Airways (Ukraine) - The YAK-40´s are used on scheduled services as a back-up only.
Regular schedule on all routes is operated by AN-24 except OZH-MSQ which is primarily AN-140 due to codeshare contract with Belavia (may only be replaced by other types when unavaillable due to maintenance)
Same applies to the AN-74TK (TK = convertible similar to Boeings B737"QC" versions ...). It is primarily used for cargo flights but occasionally operates on the passenger routes ...


BAe146 / Avro RJ

• Star Peru

DC-3
https://flagshipdetroit.org/ride-with-us/

Ford Tri Motor.
https://www.eaa.org/eaa/events-and-e...tor-tour-stops