> Note that NASA also doesn't have one: It only has SpaceX'. Another way of saying this is that SpaceX is a contractor; which means that both NASA and the ESA

> Note that NASA also doesn't have one: It only has SpaceX'. Another way of saying this is that SpaceX is a contractor; which means that both NASA and the ESA 'own' the same # of reusable rockets (zero), and have the ability to purchase the same number of reusable rockets from the industry (one, from spaceX).