Business aircraft flight activity returned to positive ­territory in August, increasing 1.7 percent from last year, after posting an almost 1-percent year-over-year decline in July, according to TraqPak data from aviation services company Argus. Midsize business jet activity soared by 8 percent and light jets ticked upward by 0.6 percent, while turboprop and large-cabin jet flying fell 1.2 percent and 2.4 percent, respectively. By operator type, the fractionals led with a 3-percent increase in flying, followed closely by the 2.4-percent rise in Part 91 activity. Part 135 charter flying fell a slight 0.3 percent from a year ago. Some individual market segments showed big gains: Part 135 midsize jet activity jumped 12.9 percent year-over-year, and Part 91 midsize jet traffic rose 8.1 percent. Argus’s TraqPak data “is serial-number-specific aircraft arrival and departure information on all IFR flights in the U.S.”