As 33South said in his title, "Just do it".
I was lucky to have a window seat on a QANTAS 747 flight in 1999 and the
views of the ever changing types of pack ice, the icebergs, the black mountains
piercing the blanket of pure white and the vastness of the high Antarctic plateau
behind them is awesome.
In fact, just as when one flies over the interior of Australia and looks down
at that desolate vastness and then appreciates the futility of the early
European explorers who went trudging off into that interior, a similar feeling arises
when one looks off into the distance at the impossible vastness of Antarctica
and imagines how tiny the figures of men would have appeared against that backdrop,
hauling sledges up onto the plateau and off into that endless sea of pure
white nothing.
Since the Erebus Disaster, the commercial charter flights now fly at more
conservative altitudes, but the views are still spectacular and the
experience will be embedded in your mind forever. Highly recommended.