What?! You don't know what Last Exile is?? lol no anyways here is a Plot summary I took off of Anime News Network:
Plot Summary: In a world that looks like the 19th century with anti-gravity devices, Claus and Lavie are pilot and co-pilot of a Vanship and act as messengers for the Guild. The pilots become involved with a mysterous mission after rescuing a little girl from a strange star-shaped killing machine. Not willing to let the girl die, they complete the mission to deliver her to the mysterious mercenary ship Sylvania, only to become part of the crew as fighter pilots.