Apple on Wednesday announced a new, 13.3-inch MacBook Air as well as a "younger brother" model that comes in at 11.6 inches. Both devices are available today, Apple chief executive Steve Jobs said during a press event at the company's Cupertino headquarters.

The 11.6-inch MacBook Air weighs 2.3 pounds and boasts five hours of battery life. It includes a 1.4-GHz Core 2 Duo processor, 1366-by-768 resolution, Nvidia GeForce 320m graphics, a full-size keyboard, multi-touch trackpad, and a camera that supports FaceTime video chat.

The 64GB version will start at $999 while the 128GB model will sell for $1,199.

The 13.3-inch model, meanwhile, includes many of the same features as the 11.6-inch MacBook Air except that it has 1440-by-900 resolution and a 1.86-GHz processor, Jobs said. That's up from the 1,280-by-800 resolution on the previous Air.

It also has seven hours of battery life; almost twice as much battery life as the original MacBook Air, Jobs said. The 13.3-inch also includes two USB ports, and weighs 2.9 pounds. At its thinnest, it is 0.11 inches.

A 128GB 13.3-inch MacBook Air will start at $1,299, while a 256GB model will sell for $1,599.

With the new MacBook Airs, Apple has gone to complete solid-state storage. As a result, the devices are two times faster than hard drives, much more relaible, and 90 percent smaller and lighter, Jobs said. He also promised a "completely silent operation."

Also at today's event, Jobs unveiled iLife 11, FaceTime for the Mac, and a new version of the Mac OS X, dubbed Lion, with a Mac App Store.