- Aberdeen (ABR)
- Aberdeen (APG)
- Abilene (ABI)
- Abilene (DYS)
- Ada (ADT)
- Adak (ADK)
- Akron (AKC)
- Akron (CAK)
- Alamogordo (ALM)
- Alamogordo (HMN)
- Alamosa (ALS)
- Albany (ABY)
- Albany (ALB)
- Albuquerque (ABQ)
- Aleknagik (WKK)
- Alexandria (AEX)
- Alexandria (AXN)
- Alexandria (ESF)
- Alice (ALI)
- Allentown/Bethlehem (ABE)
- Alliance (AIA)
- Alpena (APN)
- Alto (RUI)
- Alton/St Louis (ALN)
- Altoona (AOO)
- Altus (LTS)
- Amarillo (AMA)
- Ambler (ABL)
- Anaktuvuk Pass (AKP)
- Anchorage (ANC)
- Anchorage (EDF)
- Anchorage (MRI)
- Anderson (AND)
- Angleton (LJN)
- Aniak (ANI)
- Anniston (ANB)
- Anvik (ANV)
- Appleton (ATW)
- Arcata/Eureka (ACV)
- Arctic Village (ARC)
- Asheville (AVL)
- Ashtabula (JFN)
- Aspen (ASE)
- Astoria (AST)
- Athens (AHN)
- Atlanta (ATL)
- Atlanta (FTY)
- Atlanta (PDK)
- Atlantic City (ACY)
- Atqasuk (ATK)
- Augusta (AGS)
- Augusta (AUG)
- Augusta (DNL)
- Aurora (BFK)
- Austin (AUS)
- Baker City (BKE)
- Bakersfield (BFL)
- Baltimore (BWI)
- Baltimore (MTN)
- Bangor (BGR)
- Bar Harbor (BHB)
- Barre/Montpelier (MPV)
- Barter Island (BTI)
- Baton Rouge (BTR)
- Battle Creek (BTL)
- Baudette (BDE)
- Beale Air Force Base (BAB)
- Beaumont/Port Arthur (BPT)
- Beaver (BKW)
- Beaver Falls (BFP)
- Bedford (BED)
- Belleville (BLV)
- Bellingham (BLI)
- Bemidji (BJI)
- Bethel (BET)
- Beverly / Danvers (BVY)
- Big Piney (BPI)
- Billings (BIL)
- Biloxi (BIX)
- Binghamton (BGM)
- Birmingham (BHM)
- Bishop (BIH)
- Bismarck (BIS)
- Bloomington (BMG)
- Bloomington/Normal (BMI)
- Blountville (TRI)
- Bluefield (BLF)
- Blythe (BLH)
- Blytheville (BYH)
- Boca Raton (BCT)
- Boise (BOI)
- Bossier City (BAD)
- Boston (BOS)
- Boulder City (BLD)
- Bowling Green (BWG)
- Bozeman (BZN)
- Bradford (BFD)
- Brady (BBD)
- Brainerd (BRD)
- Branson (BKG)
- Bremerton (PWT)
- Bridgeport (BDR)
- Bridgeport (CKB)
- Brownsville (BRO)
- Brunswick (BQK)
- Brunswick (NHZ)
- Bryce Canyon (BCE)
- Buffalo (BUF)
- Bullhead City (IFP)
- Burbank (BUR)
- Burley (BYI)
- Burlington (BRL)
- Burlington (BTV)
- Burns (BNO)
- Butte (BTM)
- Camp Douglas (VOK)
- Camp Springs (ADW)
- Cape Girardeau (CGI)
- Cape Lisburne (LUR)
- Cape Newenham (EHM)