I notice that Silversea has removed mention of an included charter from Copenhagen to Kangerlussuaq.

It had been included under the Voyage Highlights.
That makes Silversea air an even better deal; $1800 including the trip on Air Greenland from Copenhagen.
Ngaire, what are the Silversea "deviation" costs? Also, can we wait to see what air they choose for us before choosing to deviate?