| Airline | Country | Established | Fleet size | Average age |
|---|---|---|---|---|
| Northern Air Cargo | United States | 4 | 39 years | |
| North-Wright Airways | Canada | 1 | 8 years | |
| North Flying | Denmark | 3 | 23 years | |
| Nordstar | Russian Federation | 10 | 22 years | |
| Nok Air | Thailand | 25 | 13 years | |
| Nippon Cargo Airlines | Japan | 1978 | 11 | 13 years |
| Nile Air | Egypt | 2009 | 6 | 16 years |
| Niki | Austria | 2003 | 17 | 15 years |
| Nextjet | Sweden | 5 | 34 years | |
| Nesm | Egypt | 3 | 20 years | |
| Neptune Air | Malaysia | 1 | 37 years | |
| Nepal Airlines | Nepal | 4 | 22 years | |
| Neos | Italy | 9 | 23 years | |
| Nature Air | Costa Rica | 1 | 8 years | |
| National Airlines | United States | 5 | 30 years | |
| Nas Air | Saudi Arabia | 2007 | 25 | 16 years |
| Myanmar Airways International | Myanmar | 3 | 8 years | |
| My Indo Airlines | Indonesia | 1 | 39 years | |
| Motor Sich JSC Airlines | Ukraine | 2 | 26 years | |
| Monarch Airlines | United Kingdom | 1968 | 1 | 10 years |
| Moldavian Airlines | Moldova, Republic of | 1 | 32 years | |
| MNG Airlines | Turkey | 7 | 28 years | |
| Mistral Air | Italy | 1984 | 4 | 27 years |
| Mihin Lanka | Sri Lanka | 1 | 18 years | |
| Middle East Airlines | Lebanon | 18 | 12 years | |
| MIAT-Mongolian Airlines | Mongolia | 1946 | 2 | 16 years |
| Miami Air International | United States | 7 | 22 years | |
| Meridiana | Italy | 1991 | 12 | 25 years |
| MASwings | Malaysia | 10 | 14 years | |
| MASKargo | Malaysia | 1947 | 68 | 11 years |
| Mas Air | Mexico | 1 | 18 years | |
| Martinair | Netherlands | 1958 | 9 | 19 years |
| Marsland Aviation | Sudan | 1 | 31 years | |
| Mango | South Africa | 7 | 24 years | |
| Mandarin Airlines | Taiwan | 1991 | 8 | 13 years |
| Malindo Air | Malaysia | 2013 | 44 | 9 years |
| Mahan Air | Iran, Islamic Republic of | 1991 | 38 | 30 years |
| Magnicharters | Mexico | 7 | 33 years | |
| Lynden Air Cargo | United States | 1 | 17 years | |
| Luxair | Luxembourg | 1948 | 17 | 13 years |
| Lufthansa CityLine | Germany | 30 | 19 years | |
| Lufthansa Cargo | Germany | 1994 | 17 | 20 years |
| Lufthansa | Germany | 1954 | 277 | 17 years |
| Lucky Air | China | 30 | 12 years | |
| LOT Polish Airlines | Poland | 1929 | 17 | 12 years |
| Loganair | United Kingdom | 21 | 33 years | |
| Lion Air | Indonesia | 2000 | 97 | 12 years |
| Linea Aerea | Venezuela | 1994 | 1 | 36 years |
| Libyan Airlines | Libyan Arab Jamahiriya | 1964 | 7 | 12 years |
| Liberia World Airlines | Libyan Arab Jamahiriya | 2015 | 2 | 18 years |
| LIAT (1974) | Antigua and Barbuda | 9 | 10 years | |
| Lao Airlines | Lao People's Democratic Republic | 11 | 12 years | |
| LANCO | Colombia | 2009 | 3 | 14 years |
| Lan Peru | Peru | 2 | 19 years | |
| LAN Ecuador | Ecuador | 5 | 14 years | |
| LAN Cargo | Chile | 1 | 26 years | |
| LAN Argentina | Argentina | 18 | 21 years | |
| LAN Airlines | Chile | 2016 | 128 | 12 years |
| Kyrgyzstan Airlines | Kyrgyzstan | 1 | 14 years | |
| Kuwait Airways | Kuwait | 25 | 11 years | |
| Kunming Airlines | China | 12 | 9 years | |
| Kulula.com | South Africa | 1946 | 19 | 22 years |
| Kuban Airlines | Russian Federation | 1 | 11 years | |
| Korean Air | Korea, Republic of | 163 | 16 years | |
| KLM Cargo | Netherlands | 1919 | 113 | 17 years |
| Kish Air | Iran, Islamic Republic of | 9 | 32 years | |
| Kenya Airways | Kenya | 1977 | 34 | 12 years |
| Kenn Borek Air | Canada | 14 | 27 years | |
| Kam Air | Afghanistan | 2003 | 3 | 33 years |
| Kalitta Air | United States | 2000 | 17 | 27 years |
| K-Mile Air | Thailand | 3 | 26 years | |
| Juneyao Airlines Co Ltd | China | 2005 | 59 | 11 years |
| Jubba Airways | Somalia | 1 | 27 years | |
| Jordan Aviation | Jordan | 9 | 31 years | |
| Jin Air | Korea, Republic of | 13 | 16 years | |
| JetSuiteX | United States | 4 | 29 years | |
| Jetstar Pacific Airlines | Vietnam | 6 | 13 years | |
| Jetstar Asia | Singapore | 17 | 14 years | |
| Jetstar | Australia | 2004 | 77 | 14 years |
| Jetsgo | Australia | 2 | 23 years | |
| JETGO Australia | Australia | 2 | 24 years | |
| JetBlue Airways | United States | 2000 | 230 | 16 years |
| Jetairfly | Belgium | 23 | 14 years | |
| Jet2.com | United Kingdom | 65 | 23 years | |
| Jet Lite | India | 2007 | 11 | 18 years |
| Jet Aviation Business Jets | Switzerland | 1 | 69 years | |
| Jet Airways | India | 97 | 15 years | |
| Jeju Air | Korea, Republic of | 28 | 18 years | |
| Jazeera Airways | Kuwait | 2004 | 7 | 12 years |
| Jat Airways | Chile | 2 | 7 years | |
| Japan TransOcean Air | Japan | 7 | 22 years | |
| Japan Airlines | Japan | 1951 | 158 | 16 years |
| Japan Air Commuter | Japan | 5 | 28 years | |
| J-Air | Japan | 22 | 11 years | |
| ITA Airways | Ireland | 2020 | 96 | 18 years |
| Israir | Israel | 1996 | 3 | 12 years |
| Isles of Scilly Skybus | United Kingdom | 7 | 40 years | |
| Island Aviation Services | Maldives | 5 | 23 years | |
| Island Air | United States | 1 | 47 years | |
| Iraqi Airways | Iraq | 31 | 13 years |