I also saw more droids last year than I did others, but I think there is a trend shift going on.
I am sure that I notice it more since I do have one now, but I made an honest effort to pay attention when I first started noticing it at the first airport.
We were waiting to board the first plane in Hattiesburg, very small airport, and a small plane. I may have seen one non iOS device out of everyone on that plane that used their phone in my view. I am not saying others did not have different devices.
When I noticed that, I pointed it out to my wife, and casually observed the handsets of people with them out in Memphis, Philadelphia, and King of Prussia. The observable trend held in all places, going and on the way back.
Obviously not scientific, but I found it interesting anyway.