That is why I asked my breeder in The Netherlands to have my puppy spend some time in a dog box (breeder called it a "cat box") so he wouldn't be stressed on the flight. He slept through both flights (AMS-ZRH, ZRH-ORD) and always sleeps during car rides, now. He didn't like the two hour train ride to Schiphol. But as it was 11pm, I let him ride on my lap.

All breeders should crate train a puppy before it goes to its new home.