He didn't even have the 'common courtesy' [=he was not even as polite as people can usually be expected to be] to say goodbye when he left.
He picked up the airport 'courtesy phone' [=a telephone that customers can use to call the company that provides it] to call for a car.
They paid a 'courtesy call' on the ambassador. [=they visited the ambassador because it was the polite thing to do]
(..) Any man of the Night's Watch, but not I, eh, boy? I'm not your boy, Lannister. I'm Lord of Winterfell while my father is away. - Then you might learn a lord's courtesy. So it's true. Hello, Bran. Do you remember anything about what happened? He has no memory of that day. (..)2011 TvShow: Game of Thrones Title: Cripples, Bastards, and Broken Things Season: 1 Episode 4