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]
(..) Of course. Please, I would be honored if you would take mine. Thank you. How very... It's a disgrace. Hush, dear. A common courtesy. Everyone's looking. Let them look! Fetch my cloak. What are we coming to? It's an insult to decency. Take me home. Hush. I beg you, my dear. (..)2012 Anna Karenina