[profmonocle]

apple.com is just a redirect to www.apple.com, which does have IPv6.

Apple has been slowly but surely adding IPv6 to their public network services - App Store and OS downloads come over IPv6, and their NTP resolver just added IPv6 support.

I guess the department that controls that apple.com -> www.apple.com redirect just hasn't bothered, which is interesting because such a simple, dumb redirect service is one of the easiest things to dual-stack (as in it probably doesn't store IPs or have to worry about blocking at all, it just responds with a 301)