Business aircraft flight activity again returned to positive territory last month, increasing 1.7 percent from last year, after posting an almost 1-percent year-over-year decline in July, according to TraqPak data released yesterday by 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. Among operators, 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. Among individual market segments, Part 135 midsize jet activity saw the only double-digit year-over-year increase last month, logging a 12.9-percent jump. Midsize jets also fared well in the Part 91 corporate segment, with an 8.1-percent increase over last August. Argus's TraqPak data "is serial-number-specific aircraft arrival and departure information on all IFR flights in the U.S."