“Heading back to Pontianak, guys! We’re now in the airport,” said 8-year-old Athar Rizki Riawan as he recorded himself playing around in Jakarta’s Soekarno-Hatta International Airport, before boarding Sriwijaya Air flight SJ182 on Saturday. Athar was among 10 children on the plane that plunged into the Java Sea minutes after taking off, as was 2-year-old Yumma Fanisyatuzahra, his second cousin whose pink Minnie Mouse hoodie was later found intact by navy divers. The crash has ripped a gaping hole in their family since Yumma’s mother Ratih Windania, as well as her grandparents Toni Ismail and Rahmawati, were also on the same plane, among the 40 adult passengers and 12 crew members who perished. The five victims had gone on vacation to West Java’s Bandung in late December and had planned to go back to West Kalimantan on New Year’s Day. The...