Flightseeing is a airplane tour around the spectaular sights of Alaska. It really is the best way to see the grand scale of the Alaskan scenery. You can take a helicopter or a small plane. I like the small planes better because helicopters make me sick to my stomach - well, so do planes but not as bad.
Here is a google search for "Flightseeing in Alaska"
Here are some Flickr photos tagged "Flightseeing in Alaska"