On Sunday, my family and I looked up as one of the presidential helicopters swooped in low toward the White House, maybe to pick up the Obama family for their vacation, which is somewhat more exotic than ours was. Still, my plans for this week include a short day trip to Cape Cod, and my flight planning included a careful review of the notam for the presidential temporary flight restriction (TFR) centered over Martha's Vineyard, an aeronautical stone's throw from the southern coast of the Cape. I also discussed my IFR flight plan with the Lockheed Martin flight-planning specialist at 1-800-wxbrief. He might have thought I was ultraparanoid, but I quizzed him on a range of possibilities -- including the off chance of cancelling my IFR flight plan when in sight of the non-tower destination airport in Chatham (KCQX if you're keeping score at home). His advice? Stay with it until you're on the ground.