Except on stunt planes (and maybe fighter jets?) that are designed to fly upside-down a significant portion of the time, the wings are angled relative to the fu

Except on stunt planes (and maybe fighter jets?) that are designed to fly upside-down a significant portion of the time, the wings are angled relative to the fuselage. Otherwise the whole plane needs to be in a nos-up attitude even for flying at a constant altitude, which would not be fuel-efficient because if the high drag. The difference between the pitch angle of the plane and that of the wings is indeed fixed in any normal aircraft.