Lego Transport Solution
I ordered two plastic boxes that pretty much exactly fit into the lower half of my travel suitcase. The other half of the suitcase then has enough room left to contain everything I need for staying abroad for about a week.
Lego MOCs will go in the boxes with liberal use of bubble wrap. Plus standard precautions of putting everything in individual bags, and taking things off MOCs that will likely detach during transport anyway.
I'll be testing this setup later this year when I fly to Seattle for BrickCon.
Last year, I transported things to BrickCon by just bubble-wrapping them and then throwing them into my travel bag along with everything else I needed for a two week trip. Nothing broke, but that probably was by blind luck. This setup should be much safer.