From the Super Mario Wiki
Airship Fortress is the fourth and final course of the Star Cup in Mario Kart DS. The course takes place both on a floating fortress in disrepair and on an airship. The course was inspired by the environment of boss levels seen in Super Mario Bros. 3 and Super Mario World. Other airships can be seen flying away in the sky.The most notable feature in the course is the Cannon Pipe that shoots racers out to the fortress through the air. Furthermore, the track includes harmful obstacles like Bullet Bills, Rocky Wrenches and more. Airship Fortress is the only course in the entire Mario Kart series to feature Bullet Bills being shot right at a player. Missions 6-2 and 7-7 are carried out here.
The track starts in a straight way, where a barrage of Bullet Bills shot from a Cannon Pipe of the craft will wipe any vehicle out if they collide. Passing this section of the track players will turn and get a boost running over a Dash Panel to enter to the deck of the airship.
Outside the ship, racers must dodge the pesky Rocky Wrenches that pop out from their trenches to attack the racer whom goes toward it. Proceeding inside the airship, players take a tight turn and reach the cellar where some crates spread in the room may contain a useful Mushroom or an unpleasant Banana Peel if the Kart breaks the box at great speed. The next room to follow includes burners moving to the sides that will cause the player to spin out if they touch the fire.
Players go out from the airship launched by the big Cannon Pipe after a dash panel, similar to DK Mountain, to arrive in the tower of the fortress through the hole the cannon clearly aimed.
Turning around through the corkscrew in the tower to go down, players finish the race. The players can also push other racers into a crack at the very end of the course.
In mission 6-2 the player has to hit 15 Rocky Wrenches using Stars. The player has 30 seconds to complete it, but once the Star runs out, the player has to get another Star from the Item Box. Stars always appear every time the player breaks one.
In mission 7-7 the player must collect 12 coins in reverse while avoiding the burners. If they get burned, they fail the mission.
Mario Kart 7
Immediately following the starting line, both drop-offs can be used to perform a trick and gain a small boost. As well, the Bullet Bills have become Banzai Bills, and are now shot out at faster intervals. The interior of the airship has some minor changes. The room with the Rocket Engines now has a fence floor with lava under it, and the Rocky Wrenches now make sounds. Hitting a Banzai Bill has the similar effect as getting blown up by a Spiny Shell or being hit by a Bullet Bill, causing the player to tumble and roll over sideways.
Launching out of the Cannon Pipe now encompasses a gliding pad, although like Waluigi Pinball and Maple Treeway, players cannot aim their flight. Players are also no longer immune to items while in the Cannon Pipe, and being hit by anything (or intentionally stowing their glider) will result in having to be rescued by Lakitu.
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