Airbus Helicopters H155 vs Bell 525 Relentless vs Leonardo Aw139

Airbus Helicopters’ H155, Bell’s 525 Relentless, and Leonardo’s AW139 all sit in the medium twin-engine helicopter market, but they occupy slightly different niches. The H155 is typically viewed as a light–medium twin optimized for executive/VIP and offshore roles, offering a practical range that is generally in the mid-hundreds of nautical miles depending on configuration and reserves, and a cabin commonly arranged for around 8 to 12 passengers (with higher-density layouts possible). The AW139 is a medium twin that has become a benchmark for utility, EMS, and offshore transport, with a broadly comparable range in the mid-hundreds of nautical miles and typical seating often around 10 to 15 passengers depending on fit-out. The Bell 525 is a larger “super-medium” twin, positioned above the other two in size and payload class, and is designed to carry more people with greater mission capability; typical layouts are often in the mid-teens, and its range is generally expected to be competitive or better than many medium twins, subject to final configuration and operating reserves.