The northbound LAX-ANC now arrives ANC around 4:00 AM, so for those of you complaining about the late arrival into SEA I say suck it up.
When AS announced Costa Rica it was obvious through the flight times it was geared mostly to LAX-CR O&D with limited connections to SEA and ANC.
When AS gets the MAX I would put some money on SEA-SJO/LIR being operated nonstop.