FWIW, and I'm sure that this is the case for *many* couples, Ms BH & I have different surnames, we share the same address, we've been happily married for 20+ yrs & we are both 1Ks who often travel together. I am the "travel agent" for the two of us & in that role book flights & in the course of doing so "manage" both accounts, for example, to apply GPUs, etc, etc, which leads to that wonderful experience & possible adverse consequences of splitting PNRs, etc, etc even though we're on the same itinerary (but I digress).