At today's WWDC keynote in San Francisco, California, Apple announced new 11-inch and 13-inch MacBook Airs, which have been designed with battery life in mind. As expected, the new Airs use Haswell processors that are designed to offer enhanced performance and improved battery life. The 11" MacBook Air will now have nine hours of battery life while the 13" Air will have a stunning 12 hours of battery life with the new Haswell processors. In addition to Haswell processors, the new MacBooks feature 802.11ac compatibility, with support for the "Gigabit WiFi" 802.11ac specification. Gigabit WiFi offers speeds up to three times as fast as existing 802.11n wireless networks. The 11" starts at $999 with 128GB and the 13" with 128GB is $1099. Apple's MacBook Airs are available today.