More important than case may be the airline you fly. The United flights I used on a bear hunt were very bad. I saw my gun case being dragged on a luggage cart. One end was on the cart and the other end was on the pavement. I could see the gun inside, the new aluminium case.
TSA had also reopened the gun case and even left a letter inside, this after being inspected and sealed. Take down guns have the advantage of being packed in a musical instrument case and the won't recieve sush harsh treatment. The video Kevin Root provided about the pelican gun case may well be the best solution.