Piper, CESSNA, AIRBUS, OTTO, and BOEING are all major airplane makers. Piper is a five-letter word, CESSNA and AIRBUS are both six-letter words, and OTTO is a four-letter word. All of these companies have been in the business of making airplanes for many years and have become well-known names in the industry. BOEING is the largest airplane maker in the world, while CESSNA is the most popular light aircraft manufacturer. AIRBUS is a European company that produces both commercial and military aircraft. OTTO is a German company that specializes in the production of small aircraft.