I have used Princess protection and the price only increased a small amt once I add flights thru Flight ease. From my research and discussion with Princess and Hal it does cover flights if booked through them. Also, you may want to ck the medical coverage. It’s not very much and a lot of health ins don’t cover out of country medical care. I used this because I liked the idea of not having to pay until final payment but I did pick up additional medical coverage thru Geoblu.