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]
(..) He's dead. - How much lab training have you had? - I dissected a frog once. You see? You see? I mean, they're just pissing on us without even the courtesy of calling it rain. - I'm going to Selfridge. - No, Grace, - I don't think that's a good idea. - No, man, this is such bullshit! (..)2009 Avatar