Victims' families said on Wednesday that some passengers had paid to get on the aircraft.
"My older brother bought a ticket to take the Hercules plane," a victim's relative, who asked to be identified only by her initials B.A., told Reuters. "He paid around 800,000 rupiah ($60)," she said, adding that her brother was a civilian.
Others told local media their relatives had paid up to 1 million rupiah to board the flight.