Do airplanes ever dump their waste while in flight? The answer is : NO WAY JOSE
Airliner toilets use either a closed waste system.. which works much like a common house toilet and flushes the wastewater into an onboard sewage tank.
Under normal circumstances.... the ground crew disposes of the sewage after the plane lands..
Even if the pilot and flight attendants wanted to empty a tank midflight.. They COULDN'T as the valve is located on the outside of the plane, and can only be opened by the ground crew....
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