| Durant Regional Airport - Eaker Field (DUA) | 21 |
| Erie-Ottawa International Airport (PCW) | 21 |
| Front Royal Warren County Airport (FRR) | 21 |
| Greenwood County Airport (GRD) | 21 |
| Guthrie-Edmond Regional Airport (GOK) | 21 |
| Hendersonville Airport (0A7) | 21 |
| Lake County Airport (LKV) | 21 |
| Madras Municipal Airport (S33) | 21 |
| Mansfield Municipal Airport (1B9) | 21 |
| McKellar-Sipes Regional Airport (MKL) | 21 |
| Montauk Airport (MTP) | 21 |
| Nevada County Airport (GOO) | 21 |
| New Garden Airport (N57) | 21 |
| New York Stewart International Airport (SWF) | 21 |
| North Little Rock Municipal Airport (ORK) | 21 |
| Northwest Florida Beaches International Airport (ECP) | 21 |
| Oconee County Regional Airport (CEU) | 21 |
| Pearson Field (VUO) | 21 |
| Petersburg James A Johnson Airport (PSG) | 21 |
| Pitt-Greenville Airport (PGV) | 21 |
| Quincy Regional Airport Baldwin Field (UIN) | 21 |
| Rafael Hernández International Airport (BQN) | 21 |
| Rigby Airport (U56) | 21 |
| San Bernardino International Airport (SBD) | 21 |
| Seamans Field (9N3) | 21 |
| Skylark Field (ILE) | 21 |
| Sonoma Valley Airport (0Q3) | 21 |
| Sterling Airport (3B3) | 21 |
| Sundance Airpark (HSD) | 21 |
| Susanville Municipal Airport (SVE) | 21 |
| Town & Country Airpark (F82) | 21 |
| A L Mangham Jr. Regional Airport (OCH) | 20 |
| Aiken Regional Airport (AIK) | 20 |
| Anderson Lake Airport (0AK1) | 20 |
| Banning Municipal Airport (BNG) | 20 |
| Bemidji Regional Airport (BJI) | 20 |
| Benton Field (O85) | 20 |
| Boundary County Airport (65S) | 20 |
| Bowers Field (ELN) | 20 |
| Capital City Airport (FFT) | 20 |
| Central Jersey Regional Airport (47N) | 20 |
| Columbus Municipal Airport (OLU) | 20 |
| Cordova Municipal Airport (CKU) | 20 |
| Eloy Municipal Airport (E60) | 20 |
| Fort Stockton Pecos County Airport (FST) | 20 |
| Fulton County Airport (RCR) | 20 |
| Gastons Airport (3M0) | 20 |
| Goose Bay Airport (Z40) | 20 |
| Goshen Municipal Airport (GSH) | 20 |
| Grand Rapids Itasca Co-Gordon Newstrom field (GPZ) | 20 |
| Great Bend Municipal Airport (GBD) | 20 |
| Greater Binghamton/Edwin A Link field (BGM) | 20 |
| Halliburton Field (DUC) | 20 |
| Herlong Airport (HEG) | 20 |
| Holbrook Municipal Airport (P14) | 20 |
| Jimmy Carter Regional Airport (ACJ) | 20 |
| La Junta Municipal Airport (LHX) | 20 |
| Lake Charles Regional Airport (LCH) | 20 |
| Lakewood Airport (N12) | 20 |
| Llano Municipal Airport (AQO) | 20 |
| London-Corbin Airport/Magee Field (LOZ) | 20 |
| Marv Skie / Lincoln County Airport (Y14) | 20 |
| Massey Ranch Airpark (X50) | 20 |
| McElroy Airfield (20V) | 20 |
| Medina Municipal Airport (1G5) | 20 |
| Michael J. Smith Field (MRH) | 20 |
| Muskogee-Davis Regional Airport (MKO) | 20 |
| Park Rapids Municipal Airport Konshok Field (PKD) | 20 |
| Pickens County Airport (LQK) | 20 |
| Pittsfield Municipal Airport (PSF) | 20 |
| Quincy Municipal Airport (2J9) | 20 |
| Richard I Bong Memorial Airport (SUW) | 20 |
| Richmond Municipal Airport (RID) | 20 |
| Rolla Downtown Airport (K07) | 20 |
| San Martin Airport (E16) | 20 |
| Seldovia Airport (SOV) | 20 |
| Sierra Blanca Regional Airport (SRR) | 20 |
| Sonoma Skypark Airport (0Q9) | 20 |
| Texarkana Regional Airport (Webb Field) (TXK) | 20 |
| Tri-State Airport / Milton J. Ferguson Field (HTS) | 20 |
| University Oxford Airport (UOX) | 20 |
| Valdez Pioneer Field (VDZ) | 20 |