Icon Aircraft’s amphibious A5 takes pilots and passengers for a joyride. 

It was a typically sunny October morning in the Southern California city of Hermosa Beach when a tiny airplane made a water landing just off the coast. The spectacle—presumed a crash landing by the local authorities—quickly drew emergency crews, ready to rescue the aircraft’s occupants. But upon closer inspection, the pilot and passenger appeared no more in danger than the tourists sunning themselves on the beach. They had climbe…