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]
(..) hold a note for far longer than anyone should. (SINGER HOLDING NOTE) Ain't he a stinker? Suits. As a courtesy to the hardworking cast and crew, we ask you to please refrain from looking at your iPad - Okay, fair enough. MALE LAWYER: Morning, (..)2020 TvShow: Family Guy Title: Movin' In (Principal Shepherd's Song) Season: 18 Episode 20