One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.
It seems that global preseason tours, driven by the need to boast revenue and satisfy the growing demand of an international fan base, shows no sign of ending soon even if jet-lagged players maybe a growing sight on the opening day of the European season.
While interning at Bank of America as a teenager, Fan gravitated to commodities trading and at Morgan Stanley she learned to make bets on refined petroleum products like diesel and jet fuel.