Virgin Atlantic is no longer partners with VX (in part due to the fact that Delta owns a good chunk of that Virgin now), and we don't know what's going to happen with Singapore, but AS definitely has CX, JL, KE, and Hainan to Asia, BA, AF, KL, and Icelandair to Europe, and AA to both. Which provides a lot of flexibility for award redemptions (and typically better rates) compared to DL's partnerships