Originally Posted by
Calculon
You must be upgraded together, regardless of when it happens, because you can't be in different cabins on the reservation. The only way to get both of you in first at the time of booking would be to book K or higher and use GGUs for both travelers.
Not quite true. While you can definitely do the above and use GGU's, you can also buy a qualifying instant upgrade fare (Y, S, B, M) and, provided there is U2 or greater, you will both be upgraded immediately.