Vortefaurt recommends inquiring at the Observatorium for records on the airship's disappearance, but warns you that the Ishgardians rarely help outsiders.
This quest is available if you have completed the quest He Who Waited Behind.
Starting the Quest
Talk to Vortefaurt west of Fallgourd Float in the North Shroud to begin the quest.
Speak with Ludovoix
Go northwest to reach the path to Coerthas Central Highlands. Go northeast to the Observatorium and talk to Ludovoix to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Ludovoix to accept the next quest: The Unending War.