Hyundai have revealed plans to develop autonomous, 'self-flying', electric taxis -- with seating for up to five passengers -- that will hit the skies by the year 2028. To deliver this, the Seoul-based manufacturer announced yesterday that it had transformed its Urban Air Mobility Division into a new company, Supernal. Supernal, which will be US-based, has said it will also be working to integrate the planned craft into existing transit networks and create necessary infrastructure. Such might include so-called vertiports -- transport hubs for flying taxis. Hyundai first revealed its concept for a flying taxi, the S-A1 Personal Air Vehicle, at last year's Consumer Electronics Show in Las Vegas.