In 1940 two men were flying from New York to Los Angeles on what was then a new DC-3. They left New York and when they landed in Philadelphia, a red truck drove up to put fuel into the wing. A little while later, they landed in Pittsburgh and, again, a red truck pulled up to fill the tanks with fuel. Each time they landed to discharge or take on passengers, a red truck would pull up and add fuel to the tanks. Finally, after landing in Kansas City and seeing truck pull up again, one said to the other, "we sure are making good time." Said the other, "yes, we are, and so is that red truck!"