The complexities of various commercial aircrafts` pressurised cargo holds and limitations on cage sizes make it a royal pain in the arse to even begin to organise.
Really? I find it strange that you say that. All of the holds are pressurised otherwise the floor would collapse. Usually at least one is air-conditioned, often the front, to suit carriage of live animals. If you think the size is limited then how do you think a single engine aircraft would carry the size? I have carried an amazing array of different animals/reptiles/birds over the years, all without an issue.
Also it is quite cost effective if they travel with you, on the other hand if they travel as freight it is expensive.
