Connecting flights coming from overseas? Seattle airport is set up to receive only one type of connecting flight the kind where the airport of origin can tag your bags through to the final destination. However when coming from some developing countries where your final destination (in the US) cannot be on your international itinerary the airports will not tag your bags through to the final destination. As a result when exiting customs in Seattle and given the choice of leaving security or going the route of "connecting flights" one should choose to leave security and collect their bags at the baggage claim of their international airlines then recheck in with their domestic airline. If your domestic flight is not on the same itinerary as your international flight (eg. you booked it online but your international flight was bought overseas) then the connecting flight sky hops have no idea where to send your bag (it's not on the tag). The main reason for this is that they "assume" your bags are checked through to your final destination. They fail to ask this important question and do not realize that every customer does not have the background to distinguish that there are multiple kinds of "connecting flights." However if they do not ask you the airline and CITY where you want your bag to go it will be lost in the airport. The airport is not small and you will be walking back and forth between the international baggage claim and your domestic airlines trying to figure out where the bags went. This is a common problem at this airport as reported to me by the lost baggage clerk in San Diego. He said that military coming from Narita through Seattle have this issue all the time. If the Sky Hop does not ask you where you want your bag to go make sure you tell him. If he says "we'll take care of everything" make sure that you discuss the destination as part of the "everything." Most likely he will tell you to take your bag off of the conveyer belt that is headed to another airline and put it on the belt that will take it to the international baggage claim. (In Seattle after going through customs the passenger takes a tram to the other terminals but the bags go on special conveyer belts either to the next airplane or to the baggage claim). Please be careful. If you are not you may have a very difficult time finding your bag or anyone who knows where your bag went.