Delta SkyMiles Medallion global upgrade certificates are now valid on Virgin Atlantic flights marketed by Delta.
Per Delta.com, global upgrades are now valid on all Delta marketed Virgin Atlantic flights worldwide.
“Valid on Delta-marketed, Virgin Atlantic-operated flights for use globally on published Economy Cabin fares booked in W, Y, B, M, S, H, Q, K, L, U, T, X or V class to Upper Class.”
I will update this post with links as soon as I’m near a computer, but check out the terms and conditions for GPUs on Delta.com.
Good move by Delta!