Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I also found this book helpful.

I have been flying for about fifteen years and have never felt comfortable on a plane. After reading this book, I must admit that I am much more relaxed - knowing that the airplanes are better equipped to handle emergencies than I ever thought. It is also comforting to know that the flight attendants are well trained to deal with any emergency. I am still a bit anxious when I fly, but now I try to concentrate on all the safety features that are discussed in the book and it has helped.