As of December 2019, Heart had a small team of seven engineers working on its ES-19 electric airliner and moved to a large hangar at Gothenburg's Säve Airport in September 2019. The airport was formerly Göteborg City Airport until 2015 when it was closed to commercial traffic due to damage to the runway that was deemed uneconomic to repair. It is still open to light aircraft.
Heart believes its conventional fixed-wing aircraft with aluminum fuselage will be relatively straightforward to certificate. With zero emissions, it is expected to deliver 75 percent lower energy costs than conventionally-fuelled aircraft, as well as 50 percent lower maintenance costs and 50 percent lower noise. These comparisons are based on current turboprop airliners such as the Dash 8, compared on a per-passenger basis and operating from a 2,460-foot runway.