| KTN | PAKT | Ketchikan International Airport | Ketchikan | |
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| MEI | KMEI | Key Field | Meridian | |
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| EYW | KEYW | Key West International Airport | Key West | |
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| JCT | KJCT | Kimble County Airport | Junction | |
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| AKN | PAKN | King Salmon Airport | King Salmon | |
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| ISO | KISO | Kinston Regional Jetport At Stallings Field | Kinston | |
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| IRK | KIRK | Kirksville Regional Airport | Kirksville | |
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| ISM | KISM | Kissimmee Gateway Airport | Kissimmee | |
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| KVL | PAVL | Kivalina Airport | Kivalina | |
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| LMT | KLMT | Klamath Falls Airport | Klamath Falls | |
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| KLW | PAKW | Klawock Airport | Klawock | |
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| ADQ | PADQ | Kodiak Airport | Kodiak | |
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| KOA | PHKO | Kona International At Keahole Airport | Kailua-Kona | |
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| OLF | KOLF | L M Clayton Airport | Wolf Point | |
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| LSE | KLSE | La Crosse Municipal Airport | La Crosse | |
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| SKF | KSKF | Lackland Air Force Base | - | |
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| FBK | PAFB | Ladd AAF Airfield | - | |
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| LCH | KLCH | Lake Charles Regional Airport | Lake Charles | |
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| SME | KSME | Lake Cumberland Regional Airport | Somerset | |
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| TVL | KTVL | Lake Tahoe Airport | South Lake Tahoe | |
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| NEW | KNEW | Lakefront Airport | - | |
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| NEL | KNEL | Lakehurst Maxfield Field Airport | Lakehurst | |
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| LAL | KLAL | Lakeland Linder Regional Airport | Lakeland | |
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| LNY | PHNY | Lanai Airport | Lanai | |
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| LNS | KLNS | Lancaster Airport | Lancaster | |
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| LAR | KLAR | Laramie Regional Airport | Laramie | |
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| LRD | KLRD | Laredo International Airport | Laredo | |
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| LRU | KLRU | Las Cruces International Airport | Las Cruces | |
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| LVS | KLVS | Las Vegas Municipal Airport | Las Vegas | |
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| BED | KBED | Laurence G Hanscom Field | Bedford | |
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| LWM | KLWM | Lawrence Municipal Airport | Lawrence | |
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| LSF | KLSF | Lawson Army Air Field (Fort Benning) | Fort Benning | |
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| LAW | KLAW | Lawton Fort Sill Regional Airport | Lawton | |
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| HOB | KHOB | Lea County Regional Airport | Hobbs | |
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| LEB | KLEB | Lebanon Municipal Airport | Lebanon | |
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| LEE | KLEE | Leesburg International Airport | Leesburg | |
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| ABE | KABE | Lehigh Valley International Airport | Allentown | |
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| SMN | KSMN | Lemhi County Airport | Salmon | |
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| NLC | KNLC | Lemoore Naval Air Station (Reeves Field) Airport | Lemoore | |
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| LWS | KLWS | Lewiston Nez Perce County Airport | Lewiston | |
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| LWT | KLWT | Lewistown Municipal Airport | Lewistown | |
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| LBL | KLBL | Liberal Mid-America Regional Airport | Liberal | |
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| LIH | PHLI | Lihue Airport | Kauai Island | |
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| LNK | KLNK | Lincoln Airport | Lincoln | |
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| LRF | KLRF | Little Rock Air Force Base | Jacksonville | |
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| LGU | KLGU | Logan-Cache Airport | Logan | |
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| LOZ | KLOZ | London-Corbin Airport/Magee Field | London | |
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| CXO | KCXO | Lone Star Executive Airport | Conroe | |
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| LGB | KLGB | Long Beach /Daugherty Field/ Airport | Long Beach | |
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| ISP | KISP | Long Island Mac Arthur Airport | Ronkonkoma | |
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