As a thought experiment, imagine a plane with minimal fuel/appliances on board with hundreds of heavy passengers that make up say 10% of the weight of the plane.
Now imagine that they have a way to synchronize a jump where temporarily for 0.5s they are airborne in relation to the plane.
(NOTE: If idea of so many heavy passengers is troublesome to you, assume this is a cargo carrier with spring loaded "widgets" that have ability to be programmed to "jump" at once.)
Questions:
Can flight dynamics be affected due to the jump at ANY phase of the flight?
What % of the typical (cargo/passanger) plane weight is the actual cargo (excluding fuel)?
Does the location of the "jumping" cargo matter? Tail vs. Cockpit
What happens if all pax/cargo suddenly jumped to tail or cockpit section?
Everybody jump!