From: Winnipeg, MB
Yep, only the docked and the disbaned will benefit from LCU's AA protetction.
As a matter of fact, and if you pay attention, in the animation, airplanes attacking TFs in a port hex, not disbanded of course, many times have to undergo a "flak phase" without ships shown, which I ascribe to ground port AA (which is usually short and not much effective), and then the usual airplanes vs ships animation, where airplanes take on ships AA as well;
I believe Alfred said the AA during the approach phase was from other ships in the TF, not the port. A TF not docked is considered to be "at sea" which could be a number of miles from the port (the hex being 40 NM wide).
No matter how bad a situation is, you can always make it worse. - Chris Hadfield : An Astronaut's Guide To Life On Earth