I have a hunch that historic patterns of non-usage (except for AR8) will be overturned by AR21 visiting Central America. There are international airports here:
and of course Panama City
There are no direct flights from Amsterdam to any of these except (as we know from AR19) Panama City. The one flight per day AMS PTY is KL757 1310 1710. However, I don't think that a twice visited country will be visited a third time. I think that one of Guatemala, San Salvador, Honduras or Nicaragua, followed by a visit to Belize (where WRP had everything set up for an earlier Amazing Race but had to reroute it).
To continue this line of thinking back into the United States, there are only 3 airports which appear to have nonstop flights on Saturdays, Miami, Houston and DFW. None of them have morning arrivals; all of them arrive in mid-afternoon:
BZE MIA AA2180 1120 1530
BZE MIA AA2104 1420 1825
BZE IAH UA5478 1125 1459
BZE IAH UA1405 1248 1624
BZE DFW AA2146 1230 1630
So that leads me back to San Salvador as a maybe better airport to leave Central America from.
That leads to these further analyses of flights from San Salvador, which are quite superior to those from Belize in earlier arrivals:
SAL MIA TA310 0855 1335
SAL IAH UA1467 0620 1032
SAL IAH TA424 0855 1305
SAL DFW TA440 0844 1304
SAL DFW A1998 0820 1250
SAL LAX TA422 1057 1327
There are additional afternoon flights but the same logic as above leads me to ignore them.