Hangar

The Hangar is where Dragons are stored when not being utilized on Berk.

A Maximum of 70 Dragons are allowed to be stored inside the Hangar.

Fortunately, you can purchase more space in lots of 10 for Runes. (Up to 150 max Hangar space as of the current game version).

During Snoggletog, on December 23, 2015 each upgraded lot of 10 was offered at 25% off the normal price of Runes.