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Correct me if I'm worng, but.... The reaction of the ground isn't anything to do with the creation of lift at the source, its just that the momentum has to go somewhere eventually.
If your bird on your outside crane started flapping, the tension in the wire would decrease, leading to a decrease in the total weight of the crane reacted through its wheels.
This lift would then have to be reacted somewhere and it would be the floor of the aeroplane the bird is in (making it heavier). If a fan blew the downwash away, the downward momentum would still be there and would have to be reacted somewhere, perhaps further down the cabin, or if the aeroplane had an opening tail, further down the airport.
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