World 1-Airship (New Super Mario Bros. 5: Clone Tag Team)

World 1-, or World 1-Airship, is the fourth level and airship of World 1 from New Super Mario Bros. 5: Clone Tag Team. It's unlocked upon completing World 1-3, and will unlock World 1-4 upon completion. This level can be unlocked upon completion of World 1-2's secret exit, and will unlock World 1- upon completion of its secret exit. The boss of this level is Bowser Jr..