Southwest Airlines on August 7, 2018 will add a daily nonstop route linking its Baltimore/Washington hub with Cancun, Mexico. The new will be assigned to the new Boeing 737-8 MAX 8 according to Airline Route.
Copyright Photo: Southwest Airlines Boeing 737-8 MAX 8 N8708Q (msn 42566) MSY (Ken Petersen). Image: 940866.
Southwest Airlines aircraft slide show:

