I’m glad you guys agree! Can I ask where in the rulebook this is covered? I cannot find it…

A friend of mine recently tried something we have never seen before. Before the US is in the war, he flew some US planes over to Europe and parked them in UK spaces. This is to prevent the Axis from taking those territories without triggering a US entrance into the war. Which of course, the Axis doesn’t want.

The only movement restrictions that we can find in the rulebook cover US naval units. But this move seems SO wrong. So… what are we missing? Is this legal? If not, why not?