I was also hired after interviewing on the 10th!
What are your friends times???
maybe since hiring is slowing down they're getting picky on who they offer interviews to.
I'd noticed that on they day of our interview most of us had some turbine time, and even some jet time... a couple with 135 experience, and plenty of multi time.
I would just guess attrition and hiring will again pick up after the holidays.. so you should keep on trying.
just my guess