Once my wife and I had to take a flight that had 4 other stops before arriving at the Dallas-Forth Worth Airport. At the first stop, a little white truck drove up to the plane and my wife watched it pull up to the wing. She asked, "What's that truck doing?"
I explained that some airlines don't completely fuel up a plane for various reasons & we were taking on more fuel. This process was repeated at the next three stops, and my wife watched the plane being fueled each time.
At the last stop, I said, "Ya know, in spite of all these delays, we're making pretty good time."
My wife pointed out the window and said, "I don't know. That lil' white truck is keeping up with us.