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]
(..) The results were definitive. The plus sign was made up of two different inks. As a gentleman, I will do you the courtesy of not saying "I told you so." Even though you just did. Dr. Hodgins, what of the test that actually matters, (..)2016 TvShow: Bones Title: The Fight in the Fixer Season: 11 Episode 15