You won't be able to get this in the normal playthrough. For this you'll need to go to 'The Old West'. Here, in the graveyard to the right from where you enter the old West, there is the spot to start the Free Play for the 'Cloud Cuckoo Land'. Start a Freeplay with Unikitty.
Now direct to the right from where you enter the level, there is a spot which can only be build with Unikitty. This spot is near a dark rain cloud. destroy the object with Unikitty and then use Unikitty to build the trampoline.
Step onto the trampoline to get on top of the rain cloud. Where you land (right to where you land) you'll see 'stars'... or rain landing on an object.
Use any other character (I used Gail) to make a jump and punch (the cross and then directly the square) which will destroy the plane.
Et voila, another trophy.