My travel plan changed and I did find 3 U space for SNA-SFO-EWR pretty much mid day good timing. No luck on any mid day LAX to easy coast 3U unless it's overnight. I used one companion fare to upfare M and the other used GGU. End up paying $1800 for 3. Companion fare is 12k. Actually. I'm wondering, can I just downfare my ticket in between T-3 and T-2, and use my MVPG complementary upgrade, will that work?