Apple CEO Tim Cook channeled his predecessor design genius Steve Jobs on Tuesday when he unveiled the iPhone Air, the company's slimmest handset yet and the biggest change in eight years to a lineup fans and analysts complained was stagnating.

Cook kicked off the company's annual product launch event at its Cupertino, California, headquarters with a Jobs quote: "For us, design goes beyond just how something looks or feels. Design is also how it works."

Inside its 5.6-millimeter slim frame — thinner than Samsung Electronics' S25 Edge at 5.8 mm — the iPhone Air's circuitry has been shrunk to the size of a few postage stamps to deliver on Apple's claim of "all-day battery life."