I've never landed with a 100kt tailwind!
We used to cruise at .84 and .86M indicated usually and were natuarally
restricted within the NATS system on the ocean. During the 'Air Race' JFK-LHR some good crossing times were converted to 'nil point' by long taxy foul ups either end.
I personally sat mesmerised one night as the G/S increased to 676 Kts in very
smooth air on a crossing from Chicago. The block time I recall beat the schedule by an hour.