As previously reported, Buckingham downgraded Southwest to Neutral from Buy. Buckingham's analyst has a more cautious revenue outlook for Southwest due to a worsening competitive backdrop and lean competitors vowing to compete aggressively. Buckingham trimmed its 2016 outlook on capacity trends and revised Southwest's operating margins to 17% in 2016 from 19.7% in 2015.

Notable companies reporting before tomorrow's open, with earnings consensus, include Merck (MRK), consensus $1.87... Caterpillar (CAT), consensus $5.14... Comcast (CMSCA), consensus 99c... Honeywell (HON), consensus $2.17... Bristol-Myers (BMY), consensus ($4.44)... Altria (MO), consensus $1.15... Keurig Dr. Pepper (KDP), consensus 35c... GE Vernova (GEV), consensus (37c)... Royal Caribbean (RCL), consensus $1.33... Tractor Supply (TSCO), consensus $1.72... Mobileye (MBLY), consensus (6c)... Textron (TXT), consensus $1.23... LabCorp (LH), consensus $3.48... Southwest Airlines (LUV), consensus (34c)... American Airlines (AAL), consensus (29c)... Harley-Davidson (HOG), consensus $1.51.