I don't know of any air taxi services that usually do that route. But I would check with the Seward visitors office. I did a flightseeing tour several years ago with a company from Seward but I don't recall the name. I am sure a company like that could do it. I am sure you are looking at a pretty hefty chunk of change to do that, especially since you will only be going one-way so you end up paying for his empty return trip too.
Try Scenic Mountain Air.
Thanks glacierlady. That sounds like the company I used when I took a scenic flightseeing tour several years ago.