I stumbled across YYC-AMS which is a KLM TATL that has good availability up front on an A330. As usual, ignore the calendar feature. But I am finding 2 and 3 seats on some days. Of course the connections aren't great, but at least from SEA there is a Horizon flight you can grab (albiet with a long layover).
Originally Posted by
blug
(4) The following TATL flights have good availability: ORD-AMS/CDG, JFK-AMS/CDG, IAD-AMS/CDG, DFW-AMS, IAH-AMS/CDG, BOS-CDG. If you can find low award to these US gateway cities, you'll have a good shot at TATL awards. These routings will usually not shown automatically so do a multi-city search.