Airbus Helicopters H175 vs Bell 525 Relentless vs Leonardo Aw139 vs Sikorsky S 76d

All four are medium twin-engine helicopters aimed at offshore transport, corporate/VIP, and utility missions, but they sit in slightly different weight and performance bands. Airbus Helicopters’ H175 is a modern super-medium designed with offshore range and comfort in mind; it typically carries around 16 passengers in an offshore layout and offers long-range capability on the order of roughly 600 nautical miles class depending on configuration and reserves. Bell’s 525 Relentless is also a super-medium, generally comparable in mission to the H175, with seating commonly around 16–19 and similarly long legs, often cited in the ~600+ nautical mile class. Leonardo’s AW139 is a highly popular medium twin that emphasizes versatility and operating economics; typical passenger seating is about 12–15 with range generally in the ~500–600 nautical mile class depending on tanks and payload. Sikorsky’s S-76D is a lighter medium twin optimized for corporate and short-to-medium offshore work, usually configured for about 8–12 passengers, with range more commonly in the ~400–500 nautical mile class. Figures vary by interior, fuel options, payload, and regulatory reserves.