Thanks, especially to rangerss75..
The reason I asked, was, that I was looking at the possibility to take the train from NYC to Chicago (We will start our trip in Chicago), instead of flying in via EWR, and AF have so far the earliest arrival in New York that I have been able to find so far.. The train leaves New York at 16:00, so CO, with arrival at EWR at 14:00, is, out of my own experience, just a little to late (Last year, we flew CO, and arrived in Manhattan just before 16:00..) Also, a certain Mr. Springsteen makes me unable to fly out the night before..
So thank you, I've just made my decision to stick with CO.. They also have the advantage that I can fly directly home from Newark on our return..