Originally Posted by
fumje
What if I want to sit at the window and my companion wants to sit at the aisle, regardless of whether the middle is occupied? How do you register that option? I don't see anything wrong with doing that, but I don't see how it is 'allowed' under the framework you're describing.
Book a window and aisle on separate rows. Preferably on opposite sides of the plane.
Since you don't want to sit next to each other, you clearly don't want to talk to each other either, since doing so over an occupied middle seat would be rude.