What is a group of dragons called?

The standard collective nouns for dragons are:

• a flight of dragons
• a weyr of dragons
• a wing of dragons

A group of dragons is referred to as a "Clan"

This was due to the fact that Dragons were believed to be sentient creatures, thus if they travelled together it was because they chose to be a part of that clan for more reasons than just being in a group.

Bonus: A group of dragon eggs is called a "Clutch".