I carry all my optics, easily breakable in transit and high dollar stuff in a carry on pelican with no issues, I've been asked why I have that stuff with me and I tell them straight up and have had no additional questions. Kestrel, LRF, binos, spotting scope and rifle scope. Replace and retorque the scope and confirm zero and then take another confirmation shot at a rock or something at distance once I'm where I'm going. This prevents the hassle of having to try and find new equipment wherever I'm going and dealing with a drawn out claims process with the airlines if/when something is damaged. It adds having to bring torque wrenches but I believe you should be bringing those anyways. Added bonus is I HAVE to reconfirm zero wherever I'm going and am confident in my setup.