I was over on my animation teacher's blog, Speaking of Animation and saw that he had made a post about animating flight. Being a DreamWorks animator, Jacob relates his post to animators working on How to Train Your Dragon, but he links to a tutorial by Brendan Body a UK trained animator who worked on Legend of the Guardians. The tutorial by Brendan is an excellent resource for animation study.
Brendan, "I created many of the hero characters' flight cycles which were then used by the rest of the animation team."
Earlier this year I posted a short animating exercise that animators could attempt to see if they could fly. It would probably be worth comparing what you learned there to this latest information.
Enjoy flying with a feature film animator. How to make birds fly good (I love the title).
More Brendan Body tutorials (Cassie will see some clips she referred to in her research about the bouncing ball)
More Jacob Gardner tutorials including animating a dancing character and understanding body language to improve animation.