Originally Posted by
sinoflyer
IIRC, the aisle seat has the smaller "third gap" in front of it. My laptop bag won't fit in it, and I never think twice about putting it in the center gap. Conversely, when I'm seated at the window, I have no problems with my seatmate putting their stuff in that spot. That center gap, although it's off-center, is really neutral ground. Anyone can use it, but I think deference should be given to the person on the aisle.
This is correct (aisle with the smaller third gap). Also, this assessment is spot on. I was in first on the A320 twice this week (I believe my first A320 CPUs since the merger, I kid you not) and the people sitting next to me had no problem splitting the middle gap 50/50. Gave us both extra leg room and we had no issues with space. Ah, harmony.