I actually just bought this DVD a few days ago.  I was fairly astounded at the visual quality of the movie, even in full screen mode.  The sound was nothing to marvel at (the gunshots, however, did sound really defined on my 5.1 surround sound system).  But I didn't buy the movie for Ford, the sound, or even the amazing clarity of its visuals.  I really bought Air Force One because of its supporting cast and its "in your face" directorial style (Wolfgang Petersen's trademark).  From William H. Macy to Gary Oldman to Glen Close to many others, this movie really shines in its supporting cast (the plane included, who gives a stunning performance, without even a stunt double).  However, an outstanding supporting cast does usually mean that the lead role (or roles) isn't doing his or her job.  I think that's the only area where this movie fails to be convincing.