I think whoever started this thread was probably wanting to know what airlines test for HIV. I know when I was hired by BA they did, but not sure if they still do. I had heard whilst I was there, they had changed their policy and would hire HIV+ people for short haul only, but this was a rumour at that time.
I imagine there are other airlines in the UK that do not HIV test; in North America (Canada and the US) it is against the law to do so. If anyone can clarify which airlines test and which ones do not, I think it would be more helpful to the person who started the thread.