The iPad Air went on sale on Friday and one day later, Saturday, already accounted for 2.33% of all iPad activity. That was the high point so far for the iPad Air which as of today, three days post launch, accounts for between 1.55% of all iPad activity.
The spike in iPad Air activity corresponded with a drop in activity on the dominant iPad, the iPad 2, which saw activity drop almost 2% to 36% of all iPad activity when the iPad Air hit its high point on Saturday.