Beechcraft King Air 360 Er vs Bell 525 Relentless vs Enstrom 480b vs Piper M600 Sls

The Beechcraft King Air 360ER and Piper M600 SLS are pressurized fixed‑wing turboprops, while the Bell 525 Relentless and Enstrom 480B are helicopters, making their “range” and “capacity” tradeoffs fundamentally different. The King Air 360ER sits in the twin‑engine business turboprop category and is oriented toward longer missions; it typically offers the greatest range of this group (on the order of roughly 1,500+ nm, depending on loading and reserves) and commonly carries about 6–9 passengers in executive layouts. The Piper M600 SLS is a single‑engine turboprop personal/business aircraft with shorter range than the 360ER (around the 1,000+ nm class) and usually seats about 4–5 passengers plus a pilot. The Bell 525 is a large, twin‑engine helicopter aimed at offshore/corporate transport; it generally carries the most people here, often around 12–16 passengers, with range commonly in the ~500–700 nm class depending on configuration. The Enstrom 480B is a light single‑engine helicopter, typically carrying 4–5 occupants, with the shortest range of the four.