The mail recently has slowed down a little. Sometimes what took 2 days may take 3 or more. The chicks don't do good after 2 days, if the weather is bad.
Oh yeah. Having a rooster crowing and moaning to itself inside a tall cardboard box in the back of a mail truck was always fun. I would ignore my route schedule and drop the birds off first thing in the morning. Not listening to that all day.