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]
(..) You know... ...you could use a little work on your manners. Why? What did I do? Well, I just don't appreciate these little courtesy responses... ...like I'm selling you aluminium siding. - I was listening. No. You couldn't wait to get back to your little conversation. No. You were talking (..)1990 TvShow: Seinfeld Title: The Stakeout Season: 1 Episode 2