This list of Three Letter Acronyms is mainly referencing IATA airport codes used in the template {{IATA}} and of redirect pages to airport articles and By plane sections of city articles for small and medium sized airports.

• ACT Canberra not Waco Regional Airport
• BAM Baikal-Amur Mainline not Battle Mountain Airport
• BCC Brisbane, not Bear Creek 3 Airport
• BVI British Virgin Islands but also used for Birdsville Airport
• CDO Cagayan de Oro not Cradock Airport
• CIS Commonwealth of Independent States not Canton Island Airport
• CRH goes to High-speed rail in China not Cherrabah Airport
• DRC Democratic Republic of the Congo not Dirico Airport
• GTA Greater Toronto Area, not Gatokae Aerodrome. YTO is the multiple airport code for Toronto-York-Peel.
• GPS GPS navigation, not Seymour Airport
• KKH Karakoram Highway, not Kongiganak Airport
• KTX High-speed rail in South Korea, not Koutiala Airport
• NYC abbreviation for city but also used as IATA code for airports in the area
• NFL American football, not NAS Fallon
• PEI Prince Edward Island, not Matecaña International Airport in Pereira, Colombia
• PRC China, not Ernest A. Love Field
• PRD Pearl River Delta, not Pardoo Airport
• PNG Papua New Guinea, not Santos Dumont Airport
• PKK Phou Khao Khouay National Protected Area, not Pakokku Airport
• RDC Democratic Republic of the Congo, not Redenção Airport
• TAS Tasmania, not Tashkent Airport
• UAE United Arab Emirates, not Mount Aue Airport
• USA used for country and not Concord Regional Airport

• EEA Europe, which is not used as an IATA airport code
• EEC European Union, which is not used as an IATA airport code
• FKK Naturism, which is not used as an IATA airport code
• FNQ Far North Queensland, which is not used as an IATA airport code
• HIV Infectious diseases, which is not used as an IATA airport code
• ICE Rail travel in Germany, which is not used as an IATA airport code
• NHL Ice hockey in North America, which is not used as an IATA airport code
• NJP Siliguri, which is not used as an IATA airport code
• NKR Nagorno-Karabakh, which is not used as an IATA airport code
• NYS New York (state), which is not used as an IATA airport code
• NRW North Rhine-Westphalia, which is not used as an IATA airport code
• NSW New South Wales, which is not used as an IATA airport code
• PWC Prince William County, which is not used as an IATA airport code
• QLD Queensland, which is not used as an IATA airport code
• UDT Udumalaippettai, which is not used as an IATA airport code
• UFO Unidentified flying objects, which is not used as an IATA airport code. Area 51 has an ICAO code but isn't on IATA.
• WDW Walt Disney World, which is not used as an IATA airport code

• CAR goes to Car not Caribou Municipal Airport
• DMZ which is not used as an IATA airport code
• FSM Federated States of Micronesia and Fort Smith Regional Airport
• KSA Kingdom of Saudi Arabia and Kosrae Airport
• ROC the airport code for Rochester, New York also the Republic of China, holding de facto control over Taiwan
• VIC not Vicenza Airport
• YHA

• EDP Wikivoyage:Non-free content, which is not used as an IATA airport code
• FAQ Wikivoyage:FAQ, not Frieda River Airport
• MOS Wikivoyage:Manual of style, not Moses Point Airport
• POV Wikivoyage:Be fair, no Prešov Air Base
• SEO Wikivoyage:Don't tout, not Séguéla Airpor
• NOT Wikivoyage:What is an article? is also Marin County airport
• TDF Wikivoyage:Time and date formats, which is not used as an IATA airport code
• VFD Wikivoyage:Votes for deletion, which is not used as an IATA airport code