Business aircraft activity bounced back last month,climbing 2.4 percent year-over-year,after August saw a slight erosion,according to TraqPak data released late last week by Argus International.However,this fell short of Argus’s expectation of a 4.9 percent increase for September;the company is predicting a 0.8 percent rise in flying this month.All aircraft operator categories experienced gains in year-over-year flight activity last month.