This is a super newb question but....
Jump packs; How far can a Space Marine with agility 4 and 5 respectively move with a jump pack and almost more importantly how does Flying trait 12 work with regards to half moves full moves runs and charges. I've had Marines in different games moving speeds from diddidle-i-doh to damned if I know.
I know this is pretty basic but Flyers to my mind aren't well explained in the rule book.