World 4-Airship (New Super Mario Bros. Wii)

 is the first Airship level in New Super Mario Bros. Wii.

Layout
The main enemies in this level are the Mechakoopas and the Burners. Near the end, there are Cannons and pipes that release Bob-ombs. The flames from the Burners can make them explode. The boss of the airship is Bowser Jr. in his Junior Clown Car. The player must propel up with Propeller Blocks, or a Propeller Suit, and stomp on his head three times. The Propeller Blocks can also be utilized as weapons, dealing damage equal to a single stomp when thrown at Bowser Jr. After Bowser Jr. is defeated, Magikoopa flies up with Bowser Jr. They then eject Mario and gang from the Airship, which flies away, forcing Mario to chase it to World 5.

Star Coins

 * Star Coin 1: The first Star Coin is in a small alcove in the ground, next to the first long Burner. Mario and co. should wait for the Rocket Engine to turn to the left, then go for the Star Coin.
 * Star Coin 2: Shortly after the Checkpoint Flag is a green Warp Pipe covered by Crates. Mario and co. must Ground Pound through a Crate and into the Pipe to be taken to an area with two screw rides. The second Star Coin is floating over the second one.
 * Star Coin 3: The third Star Coin is to the bottom-left of the Yellow Pipe leading to Bowser Jr., blocked off by a Crate. Mario and co. must destroy the Crate with a Bob-omb to make the Star Coin accessible.

Enemies

 * Mechakoopas
 * Burners
 * Bob-ombs
 * Boss: Bowser Jr.