There are about 25,500 scheduled commercial flights per day around the world the world that are operated by 737s, with over 2,000 in the air at any given time. In fact, it is said that one 737 takes off or lands every two seconds. In Focus: Boeing 737 provides an in-depth photographic look at the 737 series of aircraft, featuring dozens of high quality photographs of 737s from operators around the world. Greg Gayden, author of Commercial Aviation 101, is back with this remarkable study of the most popular commercial aircraft in the world. Enjoy all the various facts and figures of the various types of 737, tidbits about the airlines they flew for, and so much more.