Originally Posted by slow2by2z
The mass and gravity of a single aircraft in comparison to the entire planet is negligible at best. It's like comparing the mass of a grain of sand to that of a car.
747-8's mass is approx. 442,000 kg. Earth is 5.9722 × 10^24 kg.
Don't have time/will to build a complex argument here but I agree with Pat, Bruce and Herk.
I think this type of argument misses the point of this thread. Remember, the plane is going to fly in circles around a point on the earth's surface for a long, long time, so it has lots of time to accelerate the earth upward. Think of sunlight hitting a solar sail as it sets of on a voyage across the solar system. But if that's your view, how do you handle the case of the plane in the box as detailed in post #33?