Just a quick question. I fly a Cirrus SR-22. For longer flights when the winds cooperate I often fly upwards of 15000. I have oxygen on board for me and my two legged passengers.
Any suggestions about flying at higher altitude with four legged passengers on board? I'm guessing the answer is probably it's better not to do it. Having said that I'm wondering if there is a flight level where I need to start to worry. Is 12,000 OK, 10,000? 5000?