Thanks have a much more robust complement of armor compared to an aircraft. They defeat the mechanism of armor penetration in munitions before impacting the arm

Thanks have a much more robust complement of armor compared to an aircraft. They defeat the mechanism of armor penetration in munitions before impacting the armor. They still take a significant beating after the munition is "defeated". Airplanes don't have armor in the same way a tank has. Even small arms fire can take out an aircraft, generally speaking.