The adventure begins in Sharn.
The players will be attempting to gain passage on an airship known as the “Silver Dragon”, headed for Xen’drik.
This is all a matter of background choices and planning, and otherwise a small fee in gold.
Over the course of the Campaign, the Silver Dragon will travel to the various continents across Eberron in search of this, that and the other thing.
The reasons are up to NPCs the players will encounter along the way, but the methods are entirely up to the players.