Airbus Helicopters H175 vs Bell 525 Relentless vs Leonardo Aw139

All three are twin‑engine, IFR‑capable helicopters aimed at offshore transport, SAR, and VIP/utility roles, but they sit in slightly different size and mission sweet spots. The Airbus Helicopters H175 and Leonardo AW139 are proven “super‑medium” workhorses widely used for offshore crew change and multi‑mission operations, while the Bell 525 Relentless is a newer clean‑sheet design positioned at the upper end of the super‑medium class with a strong emphasis on modern avionics and high‑speed, long‑range performance. On range, the AW139 typically offers the shortest reach of the three in common configurations, the H175 generally extends farther, and the 525 is usually cited as the longest‑range contender, depending on fuel fit and payload assumptions. On passenger capacity, the AW139 is commonly configured around 12–15 passengers, the H175 around 16–18, and the Bell 525 is often marketed in a similar upper‑teens layout, with exact seating varying by offshore, VIP, or EMS/SAR interiors and regulatory limits.