Seventy two. For the keen eyed, you'll notice that this is a recurring number in all Vytal Group spacecraft. So what does it mean?
Compiled anonymously of various books in the 17th century, the Lesser Key of Solomon is a grimoire on sorcery and magic. It is based on the Testament of Solomon and the ring mentioned within it that he used to seal demons.
In particular, 72 stems from the first book of the Lesser Key: the Ars Goetia - assumed to have been compiled no earlier than 1570. The Ars Goetia discusses 72 demons, ranging from Kings, to Princes, to Dukes, and more.
This is where the names of our spacecraft come from - speed demons to be tamed only by the worthy.
Duke Focalor
Marquis Marchosias
King Asmoday
Duke Astaroth
Prince Seire