Flight 44 (just as an actual example), runs las-jfk-cdg. At jfk they use a different plane* and the "connection time" is about 4 hours. It looks "nice" that you can fly on a "direct" flight from las to cdg...but this is just a "numbers" game. There are lots of other similar flights to and from las--why this charade?
*las-jfk is a 737 (and in its seat configuration) would not be useful for transatlantic service.