Piper Aircraft has expanded and upgraded its single-engine aircraft line with three new models that were announced in April: the Piper M350, M500, and M600. All three are based on earlier models, with the top-of-the-line M600 representing the most significant advancement.

The six-seat, single-engine turboprop M600 features an all-new wing design, cutting-edge Garmin G3000 touchscreen integrated avionics, and an updated interior with ergonomic seats. It cruises at about 300 mph and has a range of 1,495 miles…