I'll never forget my first flight on a 747. DEN to LAX, and for some reason the plane was almost completely empty..maybe 20 passengers. I was way back and was

I'll never forget my first flight on a 747. DEN to LAX, and for some reason the plane was almost completely empty..maybe 20 passengers. I was way back and was able to absorb the view of almost the entire airframe from the inside. As we neared the end of the takeoff roll and the pilot started to rotate, the wingtips started to raise with the stress on the wings. I've seen this before in other planes of course, but the thing that was odd was that as this continued i could see the walls of the fuselage directly over the wings start to bow inward. Not by much of course, but it was incredibly obvious and interesting. The next flight was from LAX to MEL and it was completely full. I never thought we were going to get into the air.