For the second continuous month, business aircraft flight activity in the U.S. fell slightly from a year ago, decreasing 1.5 percent last month, according to TraqPak data released this week by aviation services company Argus. (It declined 1.3 percent in September.) Continuing a trend seen this year, Part 91 operations remained in positive territory, seeing a year-over-year increase of 2.6 percent in October. Fractional flying, meanwhile, slipped by 3.1 percent from a year ago. And for the ninth consecutive month, Part 135 charter activity fell–this time by 7.9 percent from October 2010. Aircraft category results were down almost across the board, with the exception of light jet flying, which increased by a mere 0.4 percent from last year. Large-cabin jets led the decline at -2.6 percent, followed by turboprops (-2.3 percent) and midsize jets (-1.5 percent). Looking at individual market segments, Part 91 light-jet activity saw the largest year-over-year gain, rising 8.7 percent, while the fractional light-jet segment saw the biggest decline in flying at -14.5 percent (this on top of a decline of 14 percent in September). Argus’s TraqPak data “is serial-number-specific aircraft arrival and departure information on all IFR flights in the U.S.”