According to Apple, if you are using a non-Apple 802.11n wireless router that has out of date firmware, you may experience problems with Remote Disc, Migration or Remote Install in the MacBook Air.
Apple this week posted an article on its website Wednesday alerting users to a problem with some out-of-date base stations. Shortly after the story posted, the knowledge base article was pulled from Apple's servers - yesterday Aoole updated and reposted the note.
If you have any problems, Apple recommends updating the firmware in your router.
Two other knowledge base articles were also removed from Apple's servers - those articles have not been reposted.