PChan3 : SteamShip - SteamBoat - Pirates

SteamShip

Coal-powered air ship, with small inventory and ability to fire arrows.

Use anchor on board to stabilize the ship while flying.

Control keys configurable in Minecraft "Controls" menu.

SteamBoat

Coal-powered boat, goes faster than normal boats, insensitive to collision with solid blocks.

Use anchor on board to stop the boat.

Pirates

Flying mobs in overworld, fire arrows at players.

Spawning behavior controlled through configuration file.

Included textures are originals from Glimmar, check his topic for more. You can find alternative textures at the mod support section.
Each part of the mod can be disabled separately in the "pchan3.cfg" file.

Mod installation procedure:
1/ Install Forge
2/ Download the mod and put it in your /mods folder (or /mods/'mc version' starting from 1.6.2)