I was quite concerned traveling with the modular myself, but after a number of trips (both domestic and international) I can say that I had zero issues. I own 2 variations of the Elite Modular cases (6u and 12u) and always found space in the overhead. Security checks have been easy, and other than having the case dusted for explosives there wasn’t a single question. I wanted to share one big issue I faced on my last international flight though, as I’m still trying to find out how to avoid this in the future. Here’s my story: I brought the 6u case on board with me, but checked in power adaptors and cables plus my Digitakt that I’m also using in my Modular setup. Unfortunately, my suitcase didn’t make the connecting flight which left me with my Eurorack case without the other essentials. There would have been no way for me to carry all those cables and adaptors on the plane, as you’re only allowed a small backpack in addition to the carry-on suitcase. Luckily my show was on the following evening, and the suitcase arrived in time for the soundcheck. However, I’m now more anxious checking in things than bringing them with me on board 