Bell 525 Relentless vs Leonardo Aw139 vs Leonardo Aw169 vs Sikorsky S 76d

The Bell 525 Relentless is a larger, modern super‑medium helicopter aimed at longer missions; it typically offers the greatest range in this group (roughly around 500–600 nm depending on fit) and the highest passenger capacity, commonly configured around 16–20 seats. The Leonardo AW139 is a proven intermediate/medium twin that balances utility and offshore/EMS roles; it generally carries about 12–15 passengers and offers solid range, often roughly in the 500–700 nm class with typical reserves and options. The Leonardo AW169 sits a step smaller in the light‑intermediate category; it is usually configured for about 8–10 passengers and has a shorter range than AW139/525, commonly around 400–500 nm depending on configuration. The Sikorsky S‑76D is a light‑intermediate twin optimized for executive and specialized missions; it typically seats about 8–12 passengers and has range broadly comparable to, or slightly below, the AW169 in many real‑world layouts (often around 350–450 nm). Actual figures vary with payload, tanks, reserves, and mission equipment.