If I get a flight from BOS to PHL then from PHL to Venice were do I go through customs?    It is only a 1 and 1/2 hour layover in PHL but the price is pretty good.   I used google fly - that so far has shown me the best options.    I did look abit on that ita as well.    I think TAP was the best airline for price and times using that but using google fly it was american airlines and british airways.