[GiantTurtle]

The Eotvos effect is described as the apparent change in gravity or an object moving either east or west.
When an observer is travelling east they will experience more gravity, and when heading west will experience less gravity.
This effect is at its strongest on the equator.

How would this fit into the flat earth model of gravity?

[douglips]

You've got it backwards, eastward decreases weight - but other than that this is fascinating.

https://en.wikipedia.org/wiki/E%C3%B6tv%C3%B6s_effect

This is  an interesting idea. I think if you had a 10 kg mass in a jetliner over the equator it would weigh 35 gram-force less going east, and slightly less than 35 gram-force more going west than it does on the ground based on the graph in that article

I also found this, which will likely indicate the level of response possible from flat earth theorists:
https://www.theflatearthsociety.org/forum/index.php?topic=60071.0

[GiantTurtle]

GOD DAMMIT, I even googled that to check I spelt it correctly so I wouldn't look stupid.