I’ve added the meta tags, and tested the code with the twitter cards preview tool, and the photo cards appear to be working well in the preview tool. I’ve applied for twitter cards to be enabled, but I haven’t heard back yet.
Here’s a link to a page with the twitter cards for your review. http://www.aviationphotographic.com/2013/01/united-dreamliner-departure/
Could you please take a look and let me know if there’s anything I need to fix, or if this can be approved?