MovieFone: "Get off my plane!" Just reading that sentence, you can hear Harrison Ford barking the famous catchphrase at Gary Oldman during a climactic sequence in "Air Force One." It's a familiar line, since we've all seen the classic 1997 thriller about a president (Ford) thwarting the Russian terrorist (Oldman) who's hijacked the flying White House. Still, there's probably plenty you don't know about the movie (which opened 15 years ago, on July 25, 1997), including how accurate it is (and isn't), how the filmmakers got access to the real Air Force One, the battle over the film's instrumental score, and the financial windfall that made one cast member the richest star by far (it's not who you think). Read on for the plane (get it?) truth behind the movie.