High Quality Content by WIKIPEDIA articles! The World Junior A Challenge (WJAC) is an annual under-20 international ice hockey tournament sponsored by Hockey Canada, the Canadian Junior Hockey League (CJHL), and the International Ice Hockey Federation (IIHF). The tournament showcases Junior A level players and is modeled after the IIHF World U20 Championships, which displays the best of all junior-aged hockey players. It has been hosted by Canadian cities every year in CJAHL markets.