I also have a list of airlines that are not to be touched. In my circle, I am known as an experienced traveller and often asked for advice. Thus far, after 58 years, no mistakes but you have to keep up to date.
A relative of mine in another country is involved with the airline world there and, with a visit being booked, I checked with him about internal flights. He told me which one to avoid, due to their (not public) reputation.