What is one practical tip you rely on for ETOPS/EDTO fuel planning on North Atlantic tracks when strong winter jet streams, driftdown, and alternate adequacy collide? Can you describe a dispatch decision where you traded payload or step climbs for contingency fuel and why it worked?

For North Atlantic ETOPS fuel planning in harsh winter conditions, the most practical tip is to treat alternates and driftdown scenarios as dynamic, not fixed. I've seen dispatch decisions where we traded a small payload reduction for added contingency fuel instead of relying on optimistic winds. In one case, strong jet streams and marginal alternates pushed risk high. We planned step climbs later and carried extra fuel upfront. The flight arrived with healthier reserves and avoided last-minute reroutes. The decision worked because it prioritized predictability over theoretical efficiency.