U.S. business aircraft flight activity climbed 4.7 percent in March versus a year ago thanks to increased flying at Part 91 and fractional operators, according to TraqPak data from Argus. Part 91 flight activity surged by nearly double digits–up 9.5 percent–while fractionals saw a healthy 5.7-percent rise. The Part 135 market was the only sector that saw a decline in activity; it was down 3.2 percent year-over-year. All aircraft categories saw increased activity last month. Large-cabin jets took the lead, with 9.4 percent year-over-year growth, followed by midsize jets at 6.4 percent and turboprops at 3.4 percent. Argus’s TraqPak data “is serial-number-specific aircraft arrival and departure information on all IFR flights in the U.S.”