New airports in italics:
U.S. Domestic
ABQ - Albuquerque, NM (WN)
ATL - Atlanta, GA (DL)
AUS - Austin, TX (AA, DL, UA)
BDL - Hartford, CT (NW, UA, US)
BMI - Bloomington/Normal, IL (AA, DL)
BNA - Nashville, TN (WN)
BOS - Boston, MA (AA, B6, LH, NK, WN)
BRL - Burlington, IA (9X)
BRO - Brownsville, TX (AA)
BWI - Baltimore, MD (UA, WN)
CAK - Akron/Canton, OH (AA, DL, FL, NW, UA, WN)
CLE - Cleveland, OH (AA, B6, CO, DL, F9, NK, UA, US, WN)
CLT - Charlotte, NC (AA, US)
COS - Colorado Springs, CO (AA)
CRP - Corpus Christi, TX (AA)
DAB - Daytona Beach (AA)
DAL - Dallas Love, TX (DL, WN)
DCA - Washington, D.C. - Reagan (AA, UA)
DEC - Decatur, IL (UA)
DEN - Denver International, CO (F9, UA)
DFW - Dallas, Ft. Worth, TX (AA, B6, DL, F9, UA)
DIA - Denver Stapleton, CO (UA)
DSM - Des Moines, IA (AA, UA)
DTW - Detroit, MI (DL, NW)
ELP - El Paso, TX (AA)
ERI - Erie, PA (AA, DL, UA)
EWR - Newark, NJ (UA)
FLG - Flagstaff, AZ (AA)
FLL - Fort Lauderdale (AA, 3M)
FSM - Fort Smith, AR (AA)
GPT - Gulfport, MS (AA)
HNL - Honolulu, HI (AA, HA)
HOU - Houston Hobby (AA, WN)
HRL - Harlingen, TX (AA, WN)
IAD - Washington, D.C. - Dulles (UA)
IAH - Houston George Bush, TX (CO, UA)
JFK - New York, NY (AA, B6, DL, LH)
KOA - Kona-Kalaoa, HI (HA)
LAS - Las Vegas, NV (AA)
LAX - Los Angeles, CA (UA)
LGA - New York, NY (AA, DL, UA)
LIT - Little Rock, AR (AA, UA)
MCI - Kansas City, MO (AA)
MCO - Orlando, FL (FL, F9, UA)
MDT - Harrisburg, PA (AA)
MDW - Chicago Midway, IL (WN)
MEM - Memphis, TN (AA)
MFE - McAllen, TX (AA)
MGM - Montgomery, AL (AA)
MHT - Manchester, NH (AA)
MIA - Miami, FL (AA, DL)
MSP - Minneapolis-St. Paul, MN (AA, DL)
OKC - Oklahoma City, OK (AA, DL)
ONT - Ontario, CA (AA, UA)
ORD - Chicago O'Hare, IL (AA, UA, 9X)
ORF - Norfolk, VA (AA)
PDX - Portland, OR (F9, UA)
PHL - Philadelphia, PA (AA)
PHX - Phoenix, AZ (AA)
PIA - Peoria, IL (AA, UA)
PIT - Pittsburgh, PA (FL)
PNS - Pensacola, FL (AA)
PVD - Providence, RI (UA)
PWM - Portland, ME (AA, WN)
RDU - Raleigh/Durham, NC (AA, UA)
RSW - Ft. Myers, FL (UA)
SAN - San Diego, CA (AA, UA, WN)
SAT - San Antonio, TX (UA)
SEA - Seattle, WA (UA)
SFO - San Francisco, CA (F9, UA)
SLC - Salt Lake City, UT (AA, DL)
SNA - Orange County, CA (UA)
STL - St. Louis, MO (AA, UA, 9X)
TPA - Tampa, FL (AA, UA, 3M)
TUL - Tulsa, OK (AA)
TUS - Tucson, AZ (AA)
USA - Concord, NC
XNA - Fayetteville, AR (AA)
International:
ARN - Stockholm, Sweden
CPH - Copenhagen, Denmark
FRA - Frankfurt, Germany
MUC - Munich, Germany
YQX - Gander, Canada