From the article:
While the motorcade is in motion, highly trained Secret Service drivers execute a classic roving 'shell game,' weaving Stagecoach and Spare, or Spares, in and out among each other so that a would-be attacker would have a tough time picking the car actually containing the President. The Presidential limousines even have identical plates.
[...]
The times I've had the privilege to watch Air Force One’s arrival and departure, the motorcade moved into formation almost magically, zooming up to the President at the exact moment and speeding triumphantly across the tarmac in a wheel-like formation when he returned. Once stopped at the steps of Air Force One—just as its jet engines were spooling up—the President got out of his limousine, ran up the stairs and waved goodbye, the cabin door shutting after he entered. At that exact moment, the iconic 747 was rolling down the apron. Meanwhile the motorcade was ripping off back across the tarmac to prepare for transport. It is a single fluid and perfectly-timed set of movements.
I had never seen anything like it in my life and it plays far different in person than on television.
What I took away from these experiences, including observing the throngs of sharp shooters and heavily armed men and women staring at virtually everything behind tinted sunglasses, is this is not only a critical mission, but it is also an art form and a showcase of what we are capable of as a nation.