I have flown with many different airlines, some of which no longer exist, on a wide collection of routes. While on some of the routes I travel there is no real choice, I don't really have a favourite but there are those I avoid and one or two I refuse to fly with. The last are those who have treated me badly, although I always try to make allowances for mistakes, things going genuinely wrong and someone having a bad day. What I cannot accept is bumping someone off a flight and then saying I was too late when the flight had not boarded yet (KLM - I saw everyone in the glass enclosure), saying that although they didn't tell me when I reconfirmed 72 hours prior to departure that the time had changed to much earlier I should really be charged a no-show deduction on any refund (Qatar - I missed the flight by hours), and it is really poor show to refuse to re-book me when the aircraft goes technical and all the long haul alternatives that day are disappearing into the mists of time (Air France), failing on a two hour flight to serve anything wet apart from a tiny sealed cup of water with the meal because they ran out of time (Emirates), etc., etc. I do not expect too much these days, just to get to my destination near enough on time, with my baggage present and intact, and not to have to suffer too much from crew or "difficult" passengers.