Tavick's Landing

Airship docking is only in Highest Towers, Central - The Lyrandar Tower in particular, however if you're not arriving in Sharn by air you are mostly going through Tavick's Landing - Either through Wroann's Gate for overland travel, or Terminus Station for train. From there you can travel to the upper wards or south to Cogsgate, Dragoneyes, Blackarch, and finally Foundation - if you're adventureous you could even continue on into the Fallen in the southern tip of Dura.