https://www.devex.com/people/does-singapore-airlines-have-free-24-hour-cancellation-2249254
https://www.devex.com/people/does-singapore-airlines-have-free-24-hour-cancellation-2249875
https://www.devex.com/people/does-singapore-airlines-have-free-24-hour-cancellation-refund-policy-2250199
https://www.devex.com/people/does-singapore-airlines-have-free-24-hour-cancellation-refund-policy-2250571
