No, I asked if anyone has ever done it. You plainly said that it can be done, and I am calling you out on your BS. So, were you purposely lying, or simply embellishing on the truth in order to further your agenda? Which is it?
Jroa, why are you aggressively attacking him?
Most salt lakes have mountains surrounding them so it will not be possible, you will be looking at the sun against the edge of a mountain range. Salar de Uyuni is the largest salt plain, and might be possible there.
I have seen a double sunset while flying.
Hold altitude at sunset then dive the plane, the sun goes down. Raise altitude back again and the sun comes up again until it eventually sets the second time.
Under the Perfect Spot Light Sun Hypothesis, this is not possible as the sun is always shining downwards, therefore the higher you go the quicker the sun will disappear.