The first time you take a trip on an Airship and talk to Chief Steward Ann in the Sky Saloon, your conversation will be interrupted by an ardent young man called Rande. If you choose to ask Ann about Rande, a conversation will ensue, after which Rande will promise to stop pestering Ann if Vaan manages to deliver a message to each of her six sisters. If you agree, you will receive Ann's Letter from the Chief Steward. The seven sisters are travelling on seven different airship routes as dpeicted in the image below.

After you talk to Ann on one route, you must travel by Leisure Craft on the six remaining routes and show Ann's Lettter to each o her six sisters. The order is not important as each new route, a new sister will appear.

THE SEVEN AIRSHIP ROUTES

THE REWARD

As a reward for doing it you will be given the Ring of Renewal.