Business aircraft flight activity was 7.9 percent greater in May than in the same month last year, according to aviation services firm Argus. While this exceeds the 4.8 percent year-over-year rise in April, the industry has not seen the double-digit gains in the first half of 2010 that several analysts predicted late last year. Still, activity increased across all aircraft types and one category--midsize jets--did experience a double-digit gain, with flights up 13.6 percent by comparison with May 2009. Activity was also up for light jets (8.3 percent), large-cabin jets (5.2 percent) and turboprops (3.5 percent). Part 135 charter operators saw their flying climb 8.6 percent, while Part 91 and fractional operators each logged a 7.9-percent increase. Notably, midsize jet activity at Part 135 charter operators soared by a whopping 24.6 percent. The only other double-digit increase was for Part 91 midsize jets, which gained 10.9 percent. Meanwhile, both Part 135 turboprop and fractional large-cabin jet flying decreased slightly year-over-year. Argus's data reflects "serial-number-specific aircraft arrival and departure information on all IFR [instrument flight rules] flights in the U.S."