Hello, What is flight path angle and how does it affect an airplane? What is the difference between flight path angle (glide angle or climb angle) and angle of attack? When the flight path angle is changed during flight, does the angle of attack also changed? I found that lift is always rely on angle of attack only but from aircraft performance discussion I have seen lift also changed with the variation of flight path angle (L = W cos*gamma). Could you explain what does that mean? I reaaly confused with these two angles.