If Belize turns out to be correct, I think I've come up with a possible travel scenario.
Half the teams travel on the known flight to Miami on American Airlines:
AA276 22.55 > 06.40
Then connect to Belize by one of two flights, both American Airlines:
1. AA2103 09.55 > 11.10
2. AA2173 13.15 > 14.25
The other half of the teams fly to Houston on Continental:
CO1614 00.30 > 05.35
Then connect to Belize by one of two flights, both Continental:
1. CO1407 09.20 > 11.49
2. CO1410 13.25 > 15.53
If they use combination 1, teams will arrive half an hour apart, whereas combination 2 would leave teams 1.5 hours apart.
Just a theory at the moment, but it seems to tick all the boxes so far..