At four years, most dragons are old enough and strong enough to make their autumn and spring migrations on their own. The summer skies are full of practicing fledges, long limbed and bright eyed and keen to show their stuff.
Many have already been flying for a while, and may well have covered some of their last migration on their own, but a quick cruise in mild winds is very different to the raging hail-strewn gales over the mountains or the booming thunder in the valleys. It is not only strength of wing that is required, but strength of heart, also.
Luckily dragons are full of heart and fire and burning determination, and their eager practice hones skilled fliers and ferocious hunters.