Irvine-based Broadcom is the source of two key components in Apple's updated MacBook Air. According to a teardown published today by iFixit, the MacBook air includes the Broadcom BCM20702 chip for wireless funcationality, and a Broadcom BCM4322 Intensi-fi Single-Chip 802.11N transceiver. Apple is a major customer of Broadcom, and uses two Broadcom chips in its iPhone and iPod touch devices, three chips in the iPad, as well as other products.