| Lehigh Valley International (ABE) | Allentown | PA | Knox County Regional to Lehigh Valley International |
| Nantucket Memorial (ACK) | Nantucket | MA | Knox County Regional to Nantucket Memorial |
| Jaffrey Silver Ranch (AFN) | Jaffrey | NH | Knox County Regional to Jaffrey Silver Ranch |
| Albany International (ALB) | Albany | NY | Knox County Regional to Albany International |
| Watertown International (ART) | Watertown | NY | Knox County Regional to Watertown International |
| Nashua-Boire Field (ASH) | Nashua | NH | Knox County Regional to Nashua-Boire Field |
| Wilkes-Barre/Scranton International (AVP) | Scranton | PA | Knox County Regional to Wilkes-Barre/Scranton International |
| Barnes Municipal (BAF) | Westfield | MA | Knox County Regional to Barnes Municipal |
| Bradley International (BDL) | Windsor Locks | CT | Knox County Regional to Bradley International |
| Igor I Sikorsky Memorial (BDR) | Bridgeport | CT | Knox County Regional to Igor I Sikorsky Memorial |
| Laurence G Hanscom Field (BED) | Bedford | MA | Knox County Regional to Laurence G Hanscom Field |
| Greater Binghamton Edwin A Link Field (BGM) | Binghamton | NY | Knox County Regional to Greater Binghamton Edwin A Link Field |
| Bangor International (BGR) | Bangor | ME | Knox County Regional to Bangor International |
| Hancock County-Bar Harbor (BHB) | Bar Harbor | ME | Knox County Regional to Hancock County-Bar Harbor |
| Block Island State (BID) | Block Island | RI | Knox County Regional to Block Island State |
| Monmouth Executive (BLM) | Belmar | NJ | Knox County Regional to Monmouth Executive |
| Berlin Regional (BML) | Berlin | NH | Knox County Regional to Berlin Regional |
| Boston Logan International (BOS) | Boston | MA | Knox County Regional to Boston Logan International |
| Burlington International (BTV) | Burlington | VT | Knox County Regional to Burlington International |
| Beverly Regional (BVY) | Beverly | MA | Knox County Regional to Beverly Regional |
| Caribou Municipal (CAR) | Caribou | ME | Knox County Regional to Caribou Municipal |
| Essex County (CDW) | Caldwell | NJ | Knox County Regional to Essex County |
| Juniper (CE3) | Juniper | NB | Knox County Regional to Juniper |
| Westover Arb/Westover Metropolitan (CEF) | Chicopee | MA | Knox County Regional to Westover Arb/Westover Metropolitan |
| Claremont Municipal (CNH) | Claremont | NH | Knox County Regional to Claremont Municipal |
| Concord Municipal (CON) | Concord | NH | Knox County Regional to Concord Municipal |
| Debert (CQ3) | Debert | NS | Knox County Regional to Debert |
| Florenceville (CR3) | Florenceville | NB | Knox County Regional to Florenceville |
| St Stephen (Giddens Memorial) (CS3) | St Stephen | NB | Knox County Regional to St Stephen (Giddens Memorial) |
| Chipman (CS4) | Chipman | NB | Knox County Regional to Chipman |
| Cortland County-Chase Field (CTX) | Cortland | NY | Knox County Regional to Cortland County-Chase Field |
| Kings County Municipal (CW3) | Waterville | NS | Knox County Regional to Kings County Municipal |
| Clearwater (DJ4) | Clearwater | NB | Knox County Regional to Clearwater |
| Danbury Municipal (DXR) | Danbury | CT | Knox County Regional to Danbury Municipal |
| Doylestown (DYL) | Doylestown | PA | Knox County Regional to Doylestown |
| Dilliant-Hopkins (EEN) | Keene | NH | Knox County Regional to Dilliant-Hopkins |
| Northeast Kingdom International (EFK) | Newport | VT | Knox County Regional to Northeast Kingdom International |
| Stroudsburg-Pocono (ESP) | East Stroudsburg | PA | Knox County Regional to Stroudsburg-Pocono |
| New Bedford Regional (EWB) | New Bedford | MA | Knox County Regional to New Bedford Regional |
| Newark Liberty International (EWR) | Newark | NJ | Knox County Regional to Newark Liberty International |
| Fox Harbour (FH4) | Fox Harbour | NS | Knox County Regional to Fox Harbour |
| Elizabeth Field Airport (FID) | Fishers Island | NY | Knox County Regional to Elizabeth Field Airport |
| Francis S Gabreski (FOK) | Westhampton Beach | NY | Knox County Regional to Francis S Gabreski |
| Republic Long Island (FRG) | Farmingdale | NY | Knox County Regional to Republic Long Island |
| Eastern Slopes Regional (FRY) | Fryeburg | ME | Knox County Regional to Eastern Slopes Regional |
| Gardner Municipal (GDM) | Gardner | MA | Knox County Regional to Gardner Municipal |
| Floyd Bennett Memorial (GFL) | Glens Falls | NY | Knox County Regional to Floyd Bennett Memorial |
| Groton New London (GON) | Groton New London | CT | Knox County Regional to Groton New London |
| Columbia County (HCC) | Hudson | NY | Knox County Regional to Columbia County |
| Hartford/Brainard (HFD) | Hartford | CT | Knox County Regional to Hartford/Brainard |
| Mount Washington Regional (HIE) | Whitefield | NH | Knox County Regional to Mount Washington Regional |
| Westchester County (HPN) | White Plains | NY | Knox County Regional to Westchester County |
| East Hampton (HTO) | East Hampton | NY | Knox County Regional to East Hampton |
| Houlton International (HUL) | Houlton | ME | Knox County Regional to Houlton International |
| Tweed/New Haven (HVN) | New Haven | CT | Knox County Regional to Tweed/New Haven |
| Barnstable Municipal/Boardman-Polando Field (HYA) | Hyannis | MA | Knox County Regional to Barnstable Municipal/Boardman-Polando Field |
| Long Island Macarthur (ISP) | Islip | NY | Knox County Regional to Long Island Macarthur |
| Ithaca Tompkins Regional (ITH) | Ithaca | NY | Knox County Regional to Ithaca Tompkins Regional |
| New York/John F Kennedy International (JFK) | New York | NY | Knox County Regional to New York/John F Kennedy International |
| Central Jersey Regional (JVI) | Manville | NJ | Knox County Regional to Central Jersey Regional |
| Laconia Municipal (LCI) | Laconia | NH | Knox County Regional to Laconia Municipal |
| Linden (LDJ) | Linden | NJ | Knox County Regional to Linden |
| Lebanon Municipal (LEB) | Lebanon | NH | Knox County Regional to Lebanon Municipal |
| Auburn/Lewiston Municipal (LEW) | Auburn/Lewiston | ME | Knox County Regional to Auburn/Lewiston Municipal |
| La Guardia (LGA) | New York | NY | Knox County Regional to La Guardia |
| Lake Placid (LKP) | Lake Placid | NY | Knox County Regional to Lake Placid |
| Caledonia County (LLX) | Lyndonville | VT | Knox County Regional to Caledonia County |
| Lawrence Municipal (LWM) | Lawrence | MA | Knox County Regional to Lawrence Municipal |
| Orange County (MGJ) | Montgomery | NY | Knox County Regional to Orange County |
| Manchester (MHT) | Manchester | NH | Knox County Regional to Manchester |
| Ocean County (MJX) | Toms River | NJ | Knox County Regional to Ocean County |
| Millinocket Municipal (MLT) | Millinocket | ME | Knox County Regional to Millinocket Municipal |
| Minute Man Air Field (MMN) | Stow | MA | Knox County Regional to Minute Man Air Field |
| Morristown Municipal (MMU) | Morristown | NJ | Knox County Regional to Morristown Municipal |
| Pocono Mountains Municipal (MPO) | Mount Pocono | PA | Knox County Regional to Pocono Mountains Municipal |
| Edward F Knapp State (MPV) | Barre-Montpelier | VT | Knox County Regional to Edward F Knapp State |
| Massena International/Richards Field (MSS) | Massena | NY | Knox County Regional to Massena International/Richards Field |
| Sullivan County International (MSV) | Monticello | NY | Knox County Regional to Sullivan County International |
| Montauk (MTP) | Montauk | NY | Knox County Regional to Montauk |
| Morrisville-Stowe State (MVL) | Morrisville | VT | Knox County Regional to Morrisville-Stowe State |
| Martha's Vineyard (MVY) | Vineyard Haven | MA | Knox County Regional to Martha's Vineyard |
| Quonset State (NCO) | North Kingstown | RI | Knox County Regional to Quonset State |
| Brunswick Executive (NHZ) | Brunswick | ME | Knox County Regional to Brunswick Executive |
| Arnprior Municipal (NP3) | Arnprior | ON | Knox County Regional to Arnprior Municipal |
| Newport State (NPT) | Newport | RI | Knox County Regional to Newport State |
| Parlin Field (NWH) | Newport | NH | Knox County Regional to Parlin Field |
| Ogdensburg International (OGS) | Ogdensburg | NY | Knox County Regional to Ogdensburg International |
| Lt Warren Eaton (OIC) | Norwich | NY | Knox County Regional to Lt Warren Eaton |
| Dewitt Field/Old Town Municipal (OLD) | Old Town | ME | Knox County Regional to Dewitt Field/Old Town Municipal |
| Oneonta Municipal (ONH) | Oneonta | NY | Knox County Regional to Oneonta Municipal |
| Worcester Regional (ORH) | Worcester | MA | Knox County Regional to Worcester Regional |
| Norwood Memorial (OWD) | Norwood | MA | Knox County Regional to Norwood Memorial |
| Central Maine Regional Norridgewock (OWK) | Norridgewock | ME | Knox County Regional to Central Maine Regional Norridgewock |
| Waterbury/Oxford (OXC) | Oxford | CT | Knox County Regional to Waterbury/Oxford |
| Plattsburgh International (PBG) | Plattsburgh | NY | Knox County Regional to Plattsburgh International |
| Princeton (PCT) | Princeton | NJ | Knox County Regional to Princeton |
| Princeton Municipal (PNN) | Princeton | ME | Knox County Regional to Princeton Municipal |
| Hudson Valley Regional (POU) | Poughkeepsie | NY | Knox County Regional to Hudson Valley Regional |
| Northern Maine Regional (PQI) | Presque Isle | ME | Knox County Regional to Northern Maine Regional |
| Pittsfield Municipal (PSF) | Pittsfield | MA | Knox County Regional to Pittsfield Municipal |
| Portsmouth International at Pease (PSM) | Portsmouth | NH | Knox County Regional to Portsmouth International at Pease |
| Tyendinaga/Mohawk (PU6) | Tyendinaga | ON | Knox County Regional to Tyendinaga/Mohawk |
| Provincetown Municipal (PVC) | Provincetown | MA | Knox County Regional to Provincetown Municipal |
| Theodore Francis Green International (PVD) | Providence | RI | Knox County Regional to Theodore Francis Green International |
| Portland International Jetport (PWM) | Portland | ME | Knox County Regional to Portland International Jetport |
| Plymouth Municipal (PYM) | Plymouth | MA | Knox County Regional to Plymouth Municipal |
| Griffiss International (RME) | Rome | NY | Knox County Regional to Griffiss International |
| Rutland Southern Vermont Regional (RUT) | Rutland | VT | Knox County Regional to Rutland Southern Vermont Regional |
| Schenectady County (SCH) | Schenectady | NY | Knox County Regional to Schenectady County |
| Mont-Laurier (SD4) | Mont-Laurier | QC | Knox County Regional to Mont-Laurier |
| Lachute (SE4) | Lachute | QC | Knox County Regional to Lachute |
| Montmagny (SE5) | Montmagny | QC | Knox County Regional to Montmagny |
| Sanford Seacoast Regional (SFM) | Sanford | ME | Knox County Regional to Sanford Seacoast Regional |
| North Central State (SFZ) | Pawtucket | RI | Knox County Regional to North Central State |
| Mascouche (SK3) | Montreal | QC | Knox County Regional to Mascouche |
| Lac-a-la-Tortue (SL3) | Lac-a-la-Tortue | QC | Knox County Regional to Lac-a-la-Tortue |
| Adirondack Regional (SLK) | Saranac Lake | NY | Knox County Regional to Adirondack Regional |
| Thetford Mines (SM3) | Thetford Mines | QC | Knox County Regional to Thetford Mines |
| Victoriaville (SR3) | Victoriaville | QC | Knox County Regional to Victoriaville |
| Les Cedres (SS3) | Montreal | QC | Knox County Regional to Les Cedres |
| Stewart International (SWF) | Newburgh | NY | Knox County Regional to Stewart International |
| Sidney Municipal (SXY) | Sidney | NY | Knox County Regional to Sidney Municipal |
| Sorel (SY3) | Sorel | QC | Knox County Regional to Sorel |
| Syracuse Hancock International (SYR) | Syracuse | NY | Knox County Regional to Syracuse Hancock International |
| Teterboro (TEB) | Teterboro | NJ | Knox County Regional to Teterboro |
| Du Rocher-Perce (TG3) | Pabok | QC | Knox County Regional to Du Rocher-Perce |
| Trenton Mercer (TTN) | Trenton | NJ | Knox County Regional to Trenton Mercer |
| Hartness State (Springfield) (VSF) | Springfield | VT | Knox County Regional to Hartness State (Springfield) |
| Wilkes-Barre Wyoming Valley (WBW) | Wilkes-Barre | PA | Knox County Regional to Wilkes-Barre Wyoming Valley |
| Frenchville/Northern Aroostook Regional (WFK) | Frenchville | ME | Knox County Regional to Frenchville/Northern Aroostook Regional |
| Brookhaven (WSH) | Shirley | NY | Knox County Regional to Brookhaven |
| Westerly State (WST) | Westerly | RI | Knox County Regional to Westerly State |
| Waterville Robert Lafleur (WVL) | Waterville | ME | Knox County Regional to Waterville Robert Lafleur |
| Brockville Regional Tackaberry (XBR) | Brockville | ON | Knox County Regional to Brockville Regional Tackaberry |
| Drummondville (XDM) | Drummondville | QC | Knox County Regional to Drummondville |
| Joliette (XJL) | Joliette | QC | Knox County Regional to Joliette |
| Liverpool/South Shore Regional (YAU) | Liverpool | NS | Knox County Regional to Liverpool/South Shore Regional |
| Baie Comeau (YBC) | Baie Comeau | QC | Knox County Regional to Baie Comeau |
| Saguenay Bagotville (YBG) | Saguenay | QC | Knox County Regional to Saguenay Bagotville |
| Cornwall Regional (YCC) | Cornwall | ON | Knox County Regional to Cornwall Regional |
| Miramichi (YCH) | Miramichi | NB | Knox County Regional to Miramichi |
| Charlo (YCL) | Charlo | NB | Knox County Regional to Charlo |
| Digby Annapolis Regional (YDG) | Digby | NS | Knox County Regional to Digby Annapolis Regional |
| Dolbeau St-Felicien (YDO) | Dolbeau | QC | Knox County Regional to Dolbeau St-Felicien |
| Edmundston (YES) | Edmundston | NB | Knox County Regional to Edmundston |
| Fredericton International (YFC) | Fredericton | NB | Knox County Regional to Fredericton International |
| Forestville (YFE) | Forestville | QC | Knox County Regional to Forestville |
| Kingston (YGK) | Kingston | ON | Knox County Regional to Kingston |
| Gaspe (YGP) | Gaspe | QC | Knox County Regional to Gaspe |
| Montreal St Hubert (YHU) | Montreal | QC | Knox County Regional to Montreal St Hubert |
| Halifax Stanfield International (YHZ) | Halifax | NS | Knox County Regional to Halifax Stanfield International |
| St Jean (YJN) | St Jean | QC | Knox County Regional to St Jean |
| La Tuque (YLQ) | La Tuque | QC | Knox County Regional to La Tuque |
| Matane (YME) | Matane | QC | Knox County Regional to Matane |
| Charlevoix (YML) | Charlevoix | QC | Knox County Regional to Charlevoix |
| Maniwaki (YMW) | Maniwaki | QC | Knox County Regional to Maniwaki |
| Montreal International Mirabel (YMX) | Montreal | QC | Knox County Regional to Montreal International Mirabel |
| Gatineau-Ottawa Executive Airport (YND) | Ottawa | QC | Knox County Regional to Gatineau-Ottawa Executive Airport |
| Ottawa Macdonald Cartier Intl (YOW) | Ottawa | ON | Knox County Regional to Ottawa Macdonald Cartier Intl |
| Port Hawkesbury (YPS) | Port Hawkesbury | NS | Knox County Regional to Port Hawkesbury |
| Quebec City Jean Lesage International (YQB) | Quebec City | QC | Knox County Regional to Quebec City Jean Lesage International |
| Yarmouth (YQI) | Yarmouth | NS | Knox County Regional to Yarmouth |
| Greater Moncton International (YQM) | Moncton | NB | Knox County Regional to Greater Moncton International |
| Chicoutimi/St Honore (YRC) | Chicoutimi | QC | Knox County Regional to Chicoutimi/St Honore |
| Riviere-du-Loup (YRI) | Riviere-du-Loup | QC | Knox County Regional to Riviere-du-Loup |
| Roberval (YRJ) | Roberval | QC | Knox County Regional to Roberval |
| Ottawa/Rockcliffe (YRO) | Ottawa | ON | Knox County Regional to Ottawa/Rockcliffe |
| Ottawa/Carp (YRP) | Ottawa | ON | Knox County Regional to Ottawa/Carp |
| Trois-Rivieres (YRQ) | Trois-Rivieres | QC | Knox County Regional to Trois-Rivieres |
| Sherbrooke (YSC) | Sherbrooke | QC | Knox County Regional to Sherbrooke |
| St Georges (YSG) | St Georges | QC | Knox County Regional to St Georges |
| Smiths Falls Montague/Russ Beach (YSH) | Smiths Falls | ON | Knox County Regional to Smiths Falls Montague/Russ Beach |
| Saint John (YSJ) | Saint John | NB | Knox County Regional to Saint John |
| St Leonard (YSL) | St Leonard | NB | Knox County Regional to St Leonard |
| Summerside (YSU) | Summerside | PEI | Knox County Regional to Summerside |
| Ste Anne-des-Monts (YSZ) | Ste Anne-des-Monts | QC | Knox County Regional to Ste Anne-des-Monts |
| Alma (YTF) | Alma | QC | Knox County Regional to Alma |
| La Macaza/Mont Tremblant Intl (YTM) | La Macaza | QC | Knox County Regional to La Macaza/Mont Tremblant Intl |
| Trenton (YTN) | Trenton | NS | Knox County Regional to Trenton |
| Montreal/Pierre Elliott Trudeau Intl (YUL) | Montreal | QC | Knox County Regional to Montreal/Pierre Elliott Trudeau Intl |
| Bonaventure (YVB) | Bonaventure | QC | Knox County Regional to Bonaventure |
| Rimouski (YXK) | Rimouski | QC | Knox County Regional to Rimouski |
| Charlottetown (YYG) | Charlottetown | PEI | Knox County Regional to Charlottetown |
| Mont-Joli (YYY) | Mont-Joli | QC | Knox County Regional to Mont-Joli |
| Greenwood (YZX) | Greenwood | NS | Knox County Regional to Greenwood |
| Bathurst (ZBF) | Bathurst | NB | Knox County Regional to Bathurst |
| Bromont (ZBM) | Bromont | QC | Knox County Regional to Bromont |
