Reminds me of the scene from Wall Street where Charlie Sheen asks the airport worker where a private jet is heading, and then deduces which company is being targeted for an acquisition.
When Boeing merged with McDonnell Douglass, executives would fly to two unrelated cities and then drive to the actual meeting place for negotiations, specifically to foil this sort of surveillance.
I remember reading how people would keep track of if/where a CEO of larger company would fly prior to a quarterly report. Apparently there was a strong correlation between short trips to holiday places and good earnings reports.