Carried by Part 91 operators, business aircraft flight activity in the U.S. eked out a 0.5-percent increase in January versus the same period a year ago, according to TraqPak data from aviation services company Argus. Part 91 activity rose 6 percent year-over-year, but the Part 135 charter and Part 91K fractional segments both saw activity fall by 7.2 percent and 0.5 percent, respectively. By aircraft category, large-cabin jet activity climbed 3 percent last month over January 2010, while midsize jet flying was up 2 percent and light jets showed a 0.7-percent rise. Turboprop activity, however, fell 1.5 percent from a year ago. Argusπs TraqPak data "is serial-number-specific aircraft arrival and departure information on all IFR flights in the U.S."