(2019) "On October 14, Southwest Airlines (SWA) flew an empty aircraft to San Salvador at El Salvador International Airport in order to accomplish a heavy maint

(2019) "On October 14, Southwest Airlines (SWA) flew an empty aircraft to San Salvador at El Salvador International Airport in order to accomplish a heavy maintenance check on that aircraft. A heavy maintenance check is the most labor-intensive check performed on an aircraft during its flying life." https://amfanational.medium.com/southwest-airlines-begins-foreign-outsourcing-once-again-e0ca26961e53 https://amfanational.medium.com/southwest-airlines-begins-fo... "Today, Southwest Airlines outsources 80 percent of all aircraft maintenance. You read that correctly [...] He said United Airlines outsources 51 percent of maintenance, Alaska Airlines farms out 49 percent, Delta hires vendors for 43 percent, and American Airlines contracts out 33 percent." https://www.dallasnews.com/business/local-companies/2019/02/26/southwest-airlines-pilots-blame-company-for-stoking-unnecessary-fear-in-flying-public/ https://www.dallasnews.com/business/local-companies/2019/02/...