Just to add a bit, If you go back far enough, Bleriot etc, they had barely enough power to get off the ground so they had very high incidence angles, sort of like flying with the flaps down, which is, with flaps down a very high incidence angle wing. If the wing was parallel with the fuse, it would look like it was flying uphill and causing a lot of drag. When you think about it there is a relationship between power and incidence as time progressed. WW1 planes100 HP etc, had a lot less incidence than the older 35-40 HP Bleriots. WW2 1500 HP planes had a lot less incidence than the earlier ones. So it's a matter of keeping the fuse level as flying speed changes. I imagine the jets have very little inc. angle. Just my thoughts too