We're a family of 5, so there's always going to be an extra seat when we fly. If the flight isn't full, we WILL try to keep an open middle seat for the extra space.
However, if it's a full flight or such, we'll happily move.
Example: My daughter and I flew to Houston this past February on 2 not-quite-full flights. When we first sat down, we sat in the aisle and window seat. However, as boarding continued, when someone asked if they could sit in the middle seat, I happily moved over and gave them the aisle seat.
Yes, we like the extra space, but we're not going to be rude about it.
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