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The MacBook Air "Core 2 Duo" 2.13 13" (Late 2010) originally was offered as a "configure-to-order" option for the MacBook Air "Core 2 Duo" 1.86 13" (Late 2010), but it later was sold as a standard configuration, as well. Other than processor, this model is identical to the MC504LL/A configuration of the MacBook Air "Core 2 Duo" 1.86 13" (Late 2010), and both were offered with 256 GB of flash storage as shipped.
The Apple MacBook Air "Core 2 Duo" 2.13 13" (Late 2010) is powered by a 2.13 GHz Intel "Core 2 Duo" processor (SL9600) with two independent processor "cores" on a single chip with a 6 MB on-chip shared level 2 cache running on a 1066 MHz frontside bus.
It features 2 GB of onboard 1066 MHz DDR3 SDRAM (which only could be upgraded to 4 GB at the time of purchase, although the MC905LL/A standard configuration shipped with 4 GB of RAM by default), 256 GB of flash storage, a NVIDIA GeForce 320M "graphics processor with 256 MB of DDR3 SDRAM shared with main memory", an integrated "FaceTime" video camera, a non-backlit full-size keyboard and a 13.3" widescreen TFT LED backlit active-matrix "glossy" display (1440x900 native resolution) in a razor thin (0.11-0.68 inch), 2.9 pound, aluminum case.
Connectivity includes AirPort Extreme (802.11a/b/g/n), Bluetooth 2.1+EDR, an SD card slot, dual USB 2.0 ports, analog audio out, and video out capabilities (Mini DisplayPort) that support an external 30" display. It lacks internal Ethernet (an external adapter was available as a US$29 upgrade) and lacks Firewire and optical audio in/out as well.
The MacBook Air "Core 2 Duo" 1.86 13" (Late 2010) uses a completely new housing compared to earlier MacBook Air models -- sans "fold down" ports "door" and an "inertial" multitouch trackpad -- but also is notable for internal differences as well. Internally, it has onboard RAM and lacks an optical drive, just like its predecessors, but also has flash storage that is not intended to be upgraded after purchase and multiple internal battery cells that likewise are not designed to be replaced. Apple touts that the flash storage makes it possible for this MacBook Air model to offer "instant on" responsiveness and up to 30 days of standby time as well as a thinner housing and improved battery life.
Also see:
What are the differences between the "Late 2010" MacBook Air models? Which is the best choice for my needs?
What are the differences between the "Late 2010" MacBook Air models and the "Mid-2009" MacBook Air that they replaced?