Hi Mike and Bob
I think the issue with running the Arctic Circle Fly/Drive is not the dates but the new itinerary. When we did it, back in 2016, the Fly/drive departed from Fairbanks, crossed the Arctic Circle and the Yukon river and went up as far as Coldfoot. As the itinerary no longer visits Fairbanks and the furthest north that the revised tour goes is Denali, I assume this is the reason the Fly/Drive is no longer available as an option which is a great shame.
As we have seen previously, JY tours change and develop over time. But, in this case, having done the 'original' itinerary, I feel sorry for subsequent travellers who will miss out on Fairbanks and the wonders of the Dalton Highway. I guess that cost was a factor in the changes but as most JYers are willing to push the boat out for a 'one-in-a-lifetime' experience, I'm disappointed on their behalf that they won't have the opportunity to view the wonderful sights that we did.
Having said that, I really hope that you both get there one day, it's a truly incredible place.
All the best
Mandy