Re: iron Man's first flight or Superman's (MOS) first Flight?
Iron Man. While both were CGI-fests the Iron Man one didn't feel like it. Plus it actually had story building elements in it rather than just "ok I learned to fly, well got that checked off the list". Iron Man's flight also had elements that would come into play later in the story in a very organic way(icing problem). MoS's ain't got anything like that.
You know, it occurs to me that Captain America is basically the superhero equivalent of Mary Poppins. Practically perfect in every way and all that stuff.