But the initial success of the X1 demonstrator does not mean Heart Aerospace is planning to commercialize an all-electric aircraft. Current battery-electric systems can only typically sustain short flights of about 100 to 200 miles, which is why they have been limited to air taxi operations by companies such as Joby and Archer.

Instead, testing of the X1 and a planned follow-on X2 aircraft will shape development of Heart Aerospace’s main offering to the airline industry—a 30-seat hybrid-electric regional airliner known as the ES-30.

That planned production aircraft for commercial flights would combine two inboard electric motors with commercial turboprop engines that run on jet fuel, enabling 125 miles of all-electric flight and 500 miles of flight range when operating in hybrid mode.

Having the extended 500-mile range would enable the ES-30 hybrid-electric airliner to operate in popular short-haul corridors that connect major US and European cities. United Airlines has committed to eventually purchasing 100 aircraft from Heart Aerospace, with other major airline customers also having signed letters of intent, according to Flying magazine.

combine two inboard electric motors with commercial turboprop engines that run on jet fuel, enabling 125 miles of all-electric flight and 500 miles of flight range when operating in hybrid mode.

Would the idea be to burn fossil fuels at ground level and electric at altitudes where releasing nitrogen oxides is especially harmful to the climate?

Basically: please tell me they're prioritizing minimizing the existential cost of the climate catastrophe over the $ cost