The AIR team has announced that in April 2014 the number of AIR applications installed around the world (on different devices and desktops, so that does not include updates and reinstalls) surpassed the billion mark (that's billion with a B, as in 1,000,000,000 ). They also published some usage stats pertaining to OS (over half of the installs are on Android), use (games dominate at over 70%), and more.
I was very involved in the initial launch of Adobe AIR, and (together with the Adobe evangelism, lighthouse, and community teams) helped contribute to early successes and adoptions of the platform. And so even though I have little to do with Flash and AIR in my current role, this milestone really is a source of pride.
Congratulations, Adobe AIR!