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How old are your parents? Are they fairly self-mobile? Independent? If so, they might enjoy managing the land portion of the trip on their own - it will be cheaper, more flexible and less of a cattle call.
Upon arrival in Seward, they can take the train to Denali, spend some time there, continue north to Fairbanks (optional), then return via train to Anchorage.
They can also rent a car in Seward and do the land portion totally on their own schedule.