This shows Southwest’s ongoing commitment to the 737, which is the sole aircraft type in its fleet (split across classic and NG models), and also makes the airline the launch customer for the MAX 7 variant.
Southwest also exercised options to add five more Next-Generation 737-800s to its fleet. These airplanes, along with the 737 MAX 7s, are part of Southwest’s ongoing effort to improve fuel efficiency and profitability. The 737 MAX 7 supports Southwest’s expanding fleet modernization effort. Southwest is expected to take its first 737 MAX 7 delivery in 2019.