"A case of Real Job Protection". Negotiations. American Airlines. June 26, 2009. Archived from the original on March 14, 2012.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
William S. Swelbar (March 2010). "The Future of Scope Clauses"(PDF). 35th Annual FAA Aviation Forecast Conference. MIT International Center for Air Transportation.