It has been nearly two months since American Airlines Flight 5342 lifted off from a wintry runway in southeast Kansas, destined for Washington, D.C., with dozens of members of the tight-knit figure skating community aboard it. They were just kids, accompanied by parents and coaches, who had been attending a development camp that followed the U.S. championships in Wichita. Many had posted on social media what they had learned — those jumps and spins and techniques that form the foundation of their sport — and how eager they were to share their newfound knowledge back home. They never got that chance. On that January night, their regional jet was on approach to Ronald Reagan Washington National Airport when it collided with an Army helicopter, killing all 67 people aboard the two aircraft. “I’ll always have them in my head and my heart,” said world champion Ilia Malinin, the 20-year-old American wunderkind, who will be defending his title in Boston this week. Some of his fellow members of the Washington Figure Skating Club were aboard Flight 5342, and many of them had cheered him to victory at the U.S. championships. “Still some days I have some of those thoughts, kind of thinking about it. It does upset me a little bit that some days I won’t see them on the ice, training with me and looking up to me,” Malinin continued. “This worlds, I really want to dedicate to everyone on that flight, and give my all to the performance, and really make it special for them.” When the world championships begin Wednesday at TD Bank Garden, home of the Bruins and Celtics, they will be hosted by the renowned Skating Club of Boston, which produced such Olympic icons as Tenley Albright, Dick Button and Nancy Kerrigan. The club was rocked on Jan. 29 when it learned that three of its own young skaters — Jinna Han, Spencer Lane and Olivia Ter — and coaches Evgenia