The earnings season kicks off in earnest this week, with some of the country's biggest banks slated to report. JPMorgan Chase, Citigroup, Wells Fargo and Bank of America are all slated to post their fourth-quarter results. UnitedHealth and Delta Airlines numbers are also on deck. Overall, S & P 500 earnings are expected to have grown by 1.3% during the fourth quarter on a year-over-year basis, according to FactSet senior earnings analyst John Butters. That would be the second straight quarter of earnings expansion. However, Butters noted that analysts made "larger cuts than average" to earnings per share estimates heading into this…
