# What is this feature on a Piaggio P.180? [duplicate]

What is this feature on a Piaggio P.180?

I believe it's called a dolphin tail, but why is it exactly there and what is it for and why don't all airplanes have this?

## marked as duplicate by Pondlife, aeroalias, fooot, Greg Hewgill, voretaq7Sep 16 '15 at 4:12

• why can't all airplanes have this - who said that they can't? Whether they are required or not or would improve performance is another matter. – Simon Sep 16 '15 at 5:41