I know some fellas are PO'd, but this is FSO. This is the top notch of AH's elite squadrons-professional as it is going to get for a game. We need to read the assignments, orders and get the job done.
My own squad swaps sides almost every month and I have been denied our choice twice in the last 8-9 requests. In my opinion there is no reserved seating on one side or the other, and all squads will have to take a rotation to the both sides at times. This gives everyone the opportunity to fly aircraft on both sides if they wish to do so, and I would imagine the CM's take this in consideration when the requests get put in.
There is also another change that factors in here. G3-MF is currently on hiatus and it will cause everyone to adjust the next two months. Get ready it may happen again in January to balance sides.