The Ravens ONLY have lost to the eventual AFC Championship winner in every, single, trip to the postseason that they have forged in the Harbaugh era; and even before that (2006).
Previously, the Ravens had two appearances that resulted in losses to non-playoff advancing teams.
And of course, there are the two Champion Ravens team that embodied the AFC, and Super Bowl, champions.
This graph shows it all (click to enlarge):
It's simple: the road to the AFC Championship ALWAYS goes through Baltimore. Now, the Ravens should make two adjustments to this chart for future entries: 1)Get the games to Baltimore. 2) BE the AFC Champion in more of these.
I believe we're headed there.