By sea... Superman sitting on a torpedo, taking a break from the war. As you do. I guess this is why he didn't win it for the Allies right then in 1940.
By land... Sandman takes a page from the Crimson Avenger's stories and wraps a car around a tree. No really. That happened in almost every strip of the Crimson.
By air... Before Wonder Woman's invisible jet... or maybe it's after... Gary Concord's adventures to take place in 2240 A.D.