Used aircraft inventories continued to tighten in July across multiple segments tracked by Sandhills Global, with the sharpest annual drop in pre-owned jets. Sandhills said global used jet inventory fell 1.23% month over month and 22.97% year over year, while used jet asking prices rose 3.02% from June but were down 1.06% from a year earlier and remained on a downward trend. In North America, used single-engine piston aircraft inventory fell 2.5% month over month and 17.01% year over year, with asking values up 0.09% on the month but down 0.37% annually. Global turboprop inventory rose 0.68% from June but declined 17.74% from a year earlier, while asking values increased 0.91% month over month and 4.64% year over year. Used Robinson piston helicopter inventory fell 3.45% on the month and 8.7% on the year, while asking values gained 5.43% and 7.83%, respectively. The company said its Sandhills Equipment Value Index, or EVI (used-asset pricing benchmark), is the main metric behind the reports.