Originally Posted by jbcarioca

My personal preference would be to ignore the customs issue but include immigration, because immigration does constitute a de facto government assertion of non-domestic status. Even that has some problems since a handful; of places including Rio de Janeiro-São Paulo, have domestic flights that arrive in international terminals, thuis sometimes are subjected to immigration control. This last example is not perfect because the domestic passengers are usually, but not always, waved through immigration. Such flights do exist in several countries and often are subject to immigration checks.