How many African nations have direct air links to America?

Reaction to the attempted bombing of a U. S. airliner on Christmas Day has been mixed among the six African nations with direct air links to the United States. Ghana has announced it will install full-body scanners at Accra’s international airport by next month. Nigeria has also announced it will install the scanners at Lagos international airport. They can detect non-metallic materials hidden on the human body. But some rights groups consider the scanners an invasion of privacy, because they show private physical characteristics in detail.