10 seats per flight at $10. Others normal fair.
Nickle and dime customers by charging for everything else - advance seat assignments, food, drinks, bottled water, checked baggage - everything short of using the bathroom. Put advertising on the planes, on the tray tables - everywhere. Fly to cheaper airports, sometimes far from the “city” that you supposedly serve.
Spirit Airlines is already going down that avenue. This model works in Europe, but there is far less competition there than here in most places.