An airplane engine has to keep on running whether it is right side up, upside down, or halfway between. The plane may be climbing steeply at a comparatively low speed, or it may be in a vertical divest at a terrifically high speed. It has to take off from the ground and it may have to fly at seven or eight miles above the ground. Temperatures may vary in a few minutes from 60 degrees below zero to 130 degrees above. And we have to take precautions against any possible failure of the fuel supply. In an automobile when the engine does not get fuel it means pulling to the side of the road and perhaps blocking traffic; in an airplane, it may mean the lives of the pilot and everyone in the plane. Group of answer choices An airplane engine must run under variable circumstances An airplane flies under dangerous circumstances. Automobiles are safer than airplanes. Automobiles and airplanes have similar fuel requirements. Flag question: Question 2