Earlier SIA said they would charge 1.3 percent service fee from January 20 based on the total amount of the booking for flights departing from Singapore.
Three people, who had head injuries, abrasions and cuts, were taken to the Singapore General Hospital for treatment. However, the fourth injured person was treated at RWS' in-house clinic.
A 27-year-old Singaporean man died in motorcycle accident in Thailand's southern Phatthalung province, while a 22-year-old Singaporean woman, who was accompanying him, was injured.