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 the aisle and aisle across the aisle. Or, book a window and EXTRASEAT and the aisle. You can always book the aisle and window, just be aware you may be moved.