Here are the direct flight possibilities from the U.S. to Belize City, with the other flights from Central America to Belize city listed also:
AIR CARRIERS SERVING BELIZE
From the U.S. -
American Airlines -Direct flights from Dallas/Ft. Worth & Miami.
US Air - Direct Flights from Charlotte.
Delta Airways - Direct Flights from Atlanta.
Continental Airlines - Direct Flights from Houston.
Grupo Taca (El Salvador) - Direct flights from Houston & Miami.
From Mexico -
Direct flights to Belize are available out of Cancun and Chetumal.
From Central America -
Flights to/from Guatemala -
Belize City to/from Guatemala City - Aerovias (Monday, Wednesday & Friday)
Belize City to/from Tikal /Flores - Maya Island Air & Tropic Air (Daily)
Flights to/from Honduras - Grupo Taca
San Pedro Sula to/from Belize City
La Ceiba & Tegucigalpa to/from Belize City
First, I must say that while it is not mandatory for AR12 to have started in a city where connecting flights are not needed, I believe they did start in a direct flight city. Normally you might think that Charlotte, Atlanta or Houston would have been chosen. However, since American Airlines, that favorite of the Amazing Race for valid reasons of years of sponsorship, operates out of Dallas/Ft. Worth and Miami only, I am guessing that DFW was the originating airport. The second criteria would have been having a second carrier available for alternate flights. Houston and Miami have that. In my mind, that makes Houston the second choice since Miami has had its spot as Amazing Race start city. What do you think?