The swastika is outlawed in several countries. Companies selling products must respect those laws or have problems. Who cares enough about a stupid swastika to create problems.
Basically, some people stupidly fixate on something like the swastika that means nothing. They just want to create issues for complaints.
Why not put a picture of "Hello Kitty" on the tail of your Axis aircraft. It would mean just about as much, and maybe even get a smile from the dude that blasts your butt out of the sky.