Spring: Batman be trippin', so you know what the lesson is. Be careful with the absynthe.
Summer: Think of beaches and sand and how they terrify you. The Sandman really was scarier than the Bat-Man, wasn't he?
Fall: Another trip to Europe, another hard lesson. There are no good places to land in Switzerland.
Winter: Our first 1940 cover date, though it came out on the same month as all these other issues according to Mike's Amazing World of Comics, it presents some very goopy snow to cushion a plane's fall. See, Bulldog Martin? THIS is how you crash a plane.