https://support.cgu.edu/hc/en-us/community/posts/32160050202644–southwest-check-in-%E1%B5%80%E2%81%B1%E1%B5%90%E2%81%B1%E2%81%BF%E1%B5%8D-%E1%B5%80%E2%81%B1%E1%B5%96%CB%A2-%E1%B5%80%CA%B3%E2%81%B1%E1%B6%9C%E1%B5%8F%CB%A2
https://patch.com/arizona/phoenix/classifieds/free-stuff/497927/–1-85-583-84982-what-is-the-refund-policy-of-singapore-airlines