Hello, can you help me? I want to remember a book.

I don't remember the name, but I remember a little about the book. It is about a stewardess who falls in love with the captain and tells about her life between flights. In the end, they discover that she was an infiltrated writer, and they fire her from work.

I don't remember if it's from a Spanish or English writer.

Please help me, I'm looking for that book for a long time.​

and I think the book has something fly in the title, but I'm not sure that's where it's at.​