Thanks for the info. Now I can't wait for my chicken to get broody again. It's the best way to raise chicks!50-65F is the ideal storage temperature but as long as the egg stays between 35F and 80F, not stored for too long (under a week), and not jostled too much in transit, they should be viable. Well packaged eggs are usually fine in transit. All those I've sent eggs to had good success.
My birds don't try to fly over the fence but I do have heavy duty netting covering all of my pens. Maybe you can make a playground like in their run. I built a chicken ladder and the birds loved to get on it.