Here are the current gateways as far as I know. It should be pretty current...around a month or so old.
Atlanta, GA (ATL) Albany, NY- (ALB) Baltimore, MD (BWI)
Boston, Ma (BOS) Burbank, CA – (BUR) Charlotte, NC (CLT)
Chicago, IL (ORD) Chicago, IL – (MDW) Cleveland, OH (CLE)
Columbus, OH (CMH) Dallas-Fort Worth, TX (DFW) Denver, CO (DEN)
Durham, NC – (RDU) Houston, TX (IAH) Indianapolis, IN – (IND)
Kansas City, MO – (MCI) Las Vegas, NV (LAS) Little Rock, AR – (LIT)
Los Angeles, CA (LAX) Louisville, KY – (SDF) Memphis, TN – (MEM)
Nashville, TN – (BNA) New Orleans, LA – (MSY) New York, NY (JFK) (LGA)
Newark, NJ (EWR) Omaha, NE – (OMA) Orlando, FL (MCO)
Philadelphia, PA – (PHL) Phoenix, AZ (PHX) Pittsburgh, PA – (PIT)
Portland, OR – (PDX) Rochester, NY – (ROC) Salt Lake City, UT – (SLC)
San Diego, CA – (SAN) San Francisco, CA (SFO) Seattle, WA – (SEA)
St Louis, MO (STL) Tampa, FL (TPA) Tucson, AZ – (TUS)
West Palm Beach, FL (PBI)
Good luck all and Fly Safe.