DD - Secret Device by Tom Haase
The president of the United States is on board Air Force One and is within 20 minutes of landing at Atlanta. He receives an unexpected call from his special black operations agents Bridget Donavan and Matt Higgins. They inform him that a nuclear device is set to detonate when he lands. The Secret Service also learned there is a bomb on his plane, and any deviation from the planned flight route will cause the weapon to detonate.