For the West Coast routes out of SEA, Saver availability is decent.

Where it goes bad is heading East, though even there, ORD/DFW isn't too bad. It's ATL/MSP/anywhere on the coast where it's horrible.

Since AA is typically better routed through DFW/ORD, this mainly impacts DL (JFK/ATL/MSP), since I am guessing that AA and DL will be the first one-way partners, and DL doesn't give any low availability anyway...