This is a reference to the classical myth of the same name. Jason was a Greek mythological hero, famous as the leader of the Argonauts in their quest for the Golden Fleece.
In order to take over the kingdom of which he was rightly heir, he had to find the Golden Fleece. Jason assembled a group of heroes, known as the Argonauts after their ship, the Argo. The group included the sons of Boreas (the North Wind) who could fly, Heracles and Orpheus (all of whom feature in Riding the Ice Wind).