to get 3 segs on 1 tkt all you need to do is to fly somewhere beyond STL. You fly JFK-STL-LAX, the return can be a non-stop.Out of LGA you'll get 4 segs no nonstops except to STL. I used LAX since you'll get extra miles while you're at it,but it can be to anywhere as long as its beyond STL.Do BE CAREFULL some flights that go JFK-STL-? are the same flight # so be sure that the flight you'll be connecting to in STL is a different # than the one from NY