Bagso,
Depends on what part of the site you are looking at.
If its TCX holidays, it will be packages sold via 3rd party airlines such as Emirates etc.
If its TCX flights, then the list down to Zante are direct MAN flights, then Anchorage onwards are Condor via FRA.
This is why it is odd that JFK/MIA are in the 'MAN section'.
Hope that helps