We are headed to Yellowstone in September, flying into Bozeman via Delta Airlines. We have a rolling hard sided camera case that has our cameras and spotting scope. It's big enough that we might be asked to valet check it as opposed to putting it into the overhead compartment. We do not want to check it at the check in counter, knowing how they throw bags around. How careful are the baggage handlers with the luggage that is valet checked? Any other suggestions?