Southwest Airlines fleet Aircraft In service Orders Passengers Notes Boeing 737-700 513 — 143 Older aircraft to be retired starting in 2019. Boeing 737-800 207 — 175 Boeing 737 MAX 7 — 30 150 Launch customer; scheduled to be delivered from 2019.[1][2] 23 aircraft deferred past 2023.[3] To replace 737-700.[4] Boeing 737 MAX 8 34 245 175 Entered revenue service on October 1, 2017.