The new MacBook Air has arrived – and it has a smaller sibling. Apple's update to its ultra portable notebook range includes the addition of an 11-inch model alongside the 13-inch, with both flavors coming in at a slender 0.11-0.68 inches (0.3-1.7 cm) in height and weighing 2.3 and 2.9 pounds respectively. The top spec 13-inch has a 2.13GHz Intel Core 2 Duo processor, 256GB of flash storage, 7 hour battery life, 1440 by 900 resolution screen and, in a welcome nod to practicality, both models now feature two USB ports.

A full-size keyboard, stereo speakers and NVIDIA GeForce 320M graphics processors are featured on both models along with, 802.11n Wi-Fi, Bluetooth 2.1 and a Multi-Touch trackpad.

Along with two USB ports (sans the fiddly cover featured on the first MacBook Air) there's a Mini DisplayPort with support for up to 2560 by 1600 pixels on an external display. The 13-inch also gets an SD card slot.

11-inch MacBook Air

  • Solid state flash storage: 64GB or 128GB

Processor

  • 4GHz Intel Core 2 Duo processor with 3MB on-chip shared L2 cache
  • Optional 1.6GHz Intel Core 2 Duo processor with 3MB shared L2 cache
  • 800MHz frontside bus

Memory

  • 2GB of 1066MHz DDR3 memory / 4GB maximum configurable option
  • Height: 0.11-0.68 inch (0.3-1.7 cm)
  • Width: 11.8 inches (29.95 cm)
  • Depth: 7.56 inches (19.2 cm)
  • Weight: 2.3 pounds (1.06 kg)
  • Battery: 35-watt-hour, up to 5 hours

13-inch MacBook Air

  • Solid state flash storage: 128GB or 256GB

Processor

  • 1.86GHz Intel Core 2 Duo processor with 6MB on-chip shared L2 cache
  • Optional 2.13GHz Intel Core 2 Duo processor with 6MB shared L2 cache
  • 1066MHz frontside bus

Memory

  • 2GB of 1066MHz DDR3 memory / 4GB maximum configurable option

  • Height: 0.11-0.68 inch (0.3-1.7 cm)
  • Width: 12.8 inches (32.5 cm)
  • Depth: 8.94 inches (22.7 cm)
  • Weight: 2.9 pounds (1.32 kg)
  • Battery: 50-watt-hour, up to 7 hours

The 11-inch MacBook Air costs US$999 for the 64GB and $1,119 for the 128GB. The 13-inch costs $1,299 for the 128GB and $1,599 for the 256GB.

Apple has a comparison of the two models here.