LAX/DCA has been showing decent U availability lately (have seen for 8/2 lax-dca, 8/17 dca-lax) and I've seen U1 (and even U2) within about a week of departure on pmVX Airbus routes. These are typically the 321s so seats are typically in good condition. Have been struggling with decision whether to use GGUs given that the presence of U this far out likely means I get the upgrade anyhow as a Gold on this route.. Either way, nice to see U available on transcon routes in advance.