system
Given the following post, respond as if you're commenting on Reddit:
human
[X-Men] How does Magneto manage to fly?

In various comics and movies Magneto is shown to be able to fly. Sometimes it's easy to see that he's just standing on a metallic surface and using that (such as his escape from prison in X2) but in others there's no discernable metal under him (when he carries the stadium in Days of Future Past for example). How does he manage to make that happen just with magnetism? 

Side question: how did he manage to completely control the sentinels in Days of Future Past? Magnetism doesn't explain how he could activate all their functions instead of just move them.
gpt
1) He wears metal specifically so he can fly.  
2) He explicitly was not controlling the systems, when he released his control of one of the Sentinels, it immediately started to try to attack him until he redirected it.  He has enough metal in there to physically control the guns (and all other physical systems) rather than controlling the "software".