Paul Kantner, co-founding member of Jefferson Airplane died today after suffering a massive heart attack just days earlier.  Kantner had been with the Airplane and its later spin-off, Jefferson Starship for half a century. Kantner suffered his first heart attack back in March of 2015. After taking time off to recover, Paul returned to the stage later in the year to honor the 50th Anniversary on the Airplane.  Kantner is survived by his two sons and one daughter, Paul was 74.