Before revision: For a fixed-wing aircraft, its changing orientation with respect to the local air flow is represented by two critical angles, the angle of attack of the wing("alpha") and the angle of attack of the vertical tail, known as the sideslip angle("beta").
After revision: For a fixed-wing aircraft, its changing orientation with respect to the local air flow is represented by two critical angles, the angle of attack of the wing("alpha") and the sideslip angle("beta").