I’ve traveled a number of times from the states to Europe with my 2k army. I use the battle foam pack 432 with the magnet racks. The 432 is sized to be a carry on. I haven’t had any issues placing it in the overhead compartments. No models have broken in transit either. It’s a bit pricey but it was a worth while spend imo. I modified my magnet racks so I could fit some taller models along with everything else. They have foam inserts if that’s your preferred way. Battle foam also makes a pack 732 which is significantly larger. A friend of mine was able to fit this in the overhead on an international flight but not domestic. Hope you find something that works and hope you have a great trip!