The arrival of the Sea Harrier VTOL/STOVL fast jet meant that the Invincible-class could carry fixed-wing aircraft, despite their short flight decks. The British also introduced the ski-jump ramp as an alternative to contemporary catapult systems. As the Royal Navy retired or sold the last of its World War II-era carriers, they were replaced with smaller ships designed to operate helicopters and the V/STOVL Sea Harrier jet. The ski-jump gave the Harriers an enhanced STOVL capability, allowing them to take off with heavier payloads.