The last time Hyundai brought an electric vertical takeoff and landing (eVTOL) prototype to CES, it was 2020, and the South Korean automaker was talking bullishly about adding it to Uber’s forthcoming air taxi network. Today, Uber’s air taxi network has been sold to another startup, the air taxi industry as a whole is still struggling to get a commercial service up and running, and Hyundai is unveiling a new “product concept” that it says will be ready for production by 2028. Supernal, the autom...