score:8
As long as you have proof of exit from the US, that is all US customs and immigration will care about.
I think you can safely relax and go through the normal shuffle of collecting your bags and rechecking them in for your onward flight, etc.
Upvote:4
I did this twice last week via the USA (two separate tickets, one from Ireland to Brazil and the other from Argentina to Norway; none of these are my country of residence). As soon as I said "In transit toβ" the CBP guy stopped listening and stamped me in. No one was interested in my onward travel plans, although the first guy wanted to have a chat about Brazil. I travelled on a British passport.
Interesting the first guy gave me one day only in the stamp, the second guy gave me the full ninety days.