How does the group get past Boreas' sons?

As they fly into Quebec towards the hotel where Boreas lives, two winged figures fly out to meet them. They are the Boreads (the sons of Boreas), Zethes and Calais. They tell Jason, Leo and Piper that they do not have clearance to land and so they will have to destroy them. Piper uses her charmspeak however and persuade them to let them in. Inside, Zethes threatens Leo with his sword, but Jason soon stops him by telling Zethes that he is a son of Zeus. He says they have been expecting a son of Zeus and them up to see his father.