https://www.devex.com/people/what-is-the-refundable-option-on-expedia-is-expedia-actually-fully-refundable-2218696
https://www.yelp.com/biz_photos/singapore-airlines-san-francisco-7?select=EIW574HgEyrXdCatsM8mwQ&utm_campaign=www_photo_share_popup&utm_medium=copy_link&utm_source=%28direct%29