https://www.devex.com/people/quick-policy-how-late-can-i-cancel-my-singapore-airlines-flight-2248587
https://www.devex.com/people/quick-policy-how-late-can-i-cancel-my-singapore-airlines-flight-2248587
https://www.devex.com/people/quick-policy-how-late-can-i-cancel-my-singapore-airlines-flight-2248587