I was having the same problem as you guys.
However today i have found the two aircraft carriers.
So maybe the way i found them can help you.
First of all, i sneaked inside the Gibraltar harbour. Depending on the weather, go submerged or surfaced. Once you're inside the bay for like halfway, make a 180 degree turn and sail out of the harbour again. As soon as i sailed out of the harbour, i came across a (probably) spawned battlegroup, containing two aircraft carriers and some large battle ships. First time however, the convoy shot me to pieces so i had to do a load game. The saved game brought me back inside the bay so again i made the 180 degree turn, and to my surprise, i came across the same convoy, spawning at exactly the same spot. This time i managed to sink both carriers and sneaked away from the escorts.
The fact that, even after a load game, the carriers spawn again, makes me think that this could happen to you guys too.
Hope this works for you and good luck!
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