Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Absolutely the best aviation book ever!

This book needs a new category because five stars are not enough. I found a paperback edition in Vung Tau, Viet Nam. I was there on R&R as a military pilot in 1965. I have carried it with me in my flight bag for over twenty five years. We have been all over the world. It has been read and re-read so many times that it is stored in a plastic freezer bag to keep the pages together. I donated it to my son who recently obtained his private pilot license. Any hopeful, amateur or professional pilot will love this book.