One idea might be 1 Head Start SQC per SQD earned on bookings from 18 August to 31 December for all travel up to the end of 2026.

I know that I am deferring booking all remaining 2026 travel until 2026 as I will lose 80% of additional rollover SQM from further credit card spend in 2025.

I also know that I am a sample size of 2 (my wife and I always travel together) and am unlikely to be representative.