For all of your information 5th. freedom rights are NOT easy to get in the U.S. To my knowledge Iberia is the only scheduled airline that is allowed full 5th. freedom rights, ie picking up local pax in MIA and flying them points south. How Iberia was able to negotiate this is still a mystery to me since no U.S. based carrier enjoys the same rights out of Spain.
Various other airlines such as JAL stop over in the U.S. before continuing on to a third country but are not aloud to pick up local pax so it is not a 5th. freedom operation.
As for cabotage in the U.S. Keep dreaming.