I don't think I would have considered a 2-hour flight to Chicago "long", but agree that when my kids were babies we preferred driving over public transportation. Much easier to react to a child's mood in a car, and if they are determined to scream at least you're the only one who has to listen to it. We definitely took a few flights, but no trains until the kids were older. I don't recall ever having to change a diaper in an airplane lavatory, but maybe I just suppressed the memory. I remember changing in airport terminals, but never used the changing tables. Too many people around, rarely look all that clean, and your wife can't help you (or vice versa) since they were always single sex. We always had a changing pad and would find some corner at an unused gate in a quiet part of the airport and use the floor. Same thing when driving. We'd never use a public restroom, just drive to the back corner of some parking lot and put the kid either in or on the trunk to change him. I suppose a train is a bit different since there is no back quiet corner, and the ADA restroom is plenty large enough for both parents to enter, but again, if it was close enough to take a train, I drove instead.