Train/Ferry - window again for the reason of watching things

Besides, if one falls asleep they can rest their head on the side-

Also, one does not have to deal with the curvature of the airplane, so there should be more room... important for taller people... and those with broad shoulders

Of course, its also cool to go out on the observation deck, and watch it all fly by, for example the Staten Island Ferry, or areas on the Alaska Railroad ^