This charming image is from a National Geographic photoblog:
Kids still like watching airplanes today, but the gawkers furthest down the sidewalk don't appear to have any with them. Those lumbering beasts were novel enough to inspire fascination, and air travel still had a mystique.
Very different today, where air travel is uncomfortable, tedious, and fraught with frightening police state theater.
I also like that they felt free to pull over to the right lane of an expressway to relax and watch.