Watch out if you have a bad temper! If you have very bad conduct while in flight, an article I read this week stated that BA might start blacklisting. Already one airline has banned several passengers and the blacklisting might take the form of an international database that all airlines could access. However, the article stated that certain legal problems might prevent the airlines from implementing blacklisting. It is becoming apparent that airlines are going to be much more strict with unruly passengers.