Skyhook

Dr. Ben Cole's test of a computer program designed to save a plane experiencing flight trouble was sabotaged over the Gulf of Alaska. April Rosen's father narrowly escaped a mid-air collision in the same area. Both are being watched by people who are afraid that the Skyhook project will be discovered. What is Skyhook? Why does someone want the Skyhook project to remain a secret until it's too late to stop it?