F-16s scramble against airshow planes

"A dozen planes flew into the area, causing the North American Aerospace Defense Command to scramble its fighters. The four antiques intercepted were escorted to nearby airports and forced to land. The others were warned off."

What happened to waiting for over an hour before intercepting planes?

http://www.cnn.com/2007/US/10/08/forced.landings.ap/index.html