June RBOB prices were under pressure throughout the overnight and early morning hours, perhaps in the wake of news that Delta Airlines agreed to buy a Pennsylvania oil refinery from ConocoPhillips. That seemed to be a factor that could ease the tight supply situation along the east coast, as well as reduce some of the fear-premium in the market. Some technical traders indicated that June RBOB prices continued to struggle inside of last Monday's upside reversal range, and that might suggest a weakening trend in the market.