Flat Earth evidence experiments proving Earth round URGENT

GLP, I urgently need your help! My friend is very smart but he has fallen victim to the flat earth idiocracy. I send him evidence, he says it's all faked. So he proposed I do my own laser test. I need to get to know Pilots, people who calculate things using round earth, something from industry, to show that plane travel, clocks, satellites, the military, and most of the industrial world, use round earth calcs. Please help! Videos/links from sites is not helpful, we have looked through those, there is a 'firehose of evidence' - I need someone who works with geospatial intelligence even if you work for Direct TV and do technical work, that uses globe calcs (I have seen pilots do this, by hand, before flights, before computers did everything).