Happy Kaptain's Day.
And thanks for the links, CDV, so us new guys can see what it's about.
"In the remote days before the Foundation you could not build your own spaceship without a Captain to sail her in space. One had the idea of hire other people to build them. At those times it was very rare to see a sailor owing more than a few hundred ships. But then there had been at Trantor a little revolution in the rooms of the Captains Union, so that now a ship may be acquired even without a Captain but she cannot actually sail".
(Isaac Asimov - The Secrets of Avonmora and Other Stories)