Never lost one - have shipped in several hundred over the years from different breeders, all ages. First shipment was in 2003, last shipment was April 2011.
I've actually been surprised, some shipments have been held up over 18 hours or more and I've never had a death.
The last shipment the loaders were terrified to touch them so after leaving them under the engine/loading bay of the plane for over an hour, they finally poked them onto a luggage cart with a broom handle, then asked me to come into the back and get them. I was sure I'd have some trauma in that batch but everyone was fine. They were in the crates on that shipment for about 16 hours.
That's not normal, usually everyone is excited to see them and shipping/picking them up is a breeze.