Jack of Diamonds Bouncer

are NPCs located in some NPC Towns that will allow you enter the Jack of Diamonds airship, if your Virtue is low enough.

If your Virtue is low enough, speak to them, and they will have a keyword that will teleport you to the Jack of Diamonds.

These are located in:
 * Aerie in the Docks area.
 * Blood Bay.
 * Brittany Alleys in the North Docks area.
 * Graff Island in the Centennial Docks area.
 * Mud in the Docks area.
 * Port Harmony near the Statue of Boreas.