802.11a on Intel Macs

An Apple internal doc mentions that the WiFi devices in the new Intel Macs supports 802.11a, but that the OS won't support it.
The reason is simple: Apple now uses an Intel WiFi card which supports 802.11a/b/g. But Apple has never supported 802.11a, being an extremely uncomon protocol, which is, moreover, not compatible with b and g networks.
Intel kept the 802.11a compatibility because they were amongst the first to promote this protocol.