This was so elaborate I thought it was a parody.
A guy took a spirit level onto a plane to prove that the earth is flat.
My one question is always: If the earth is flat, how come I can get on a plane in Singapore and travel in the same direction before eventually arriving back in Singapore? A flat earth would preclude that as there would eventually be an end or an edge?
Fascinating to live in a world where people think the world is flat and scientists involved in conspiracies to cover this up. Even when they fly!