I Would have installed in every rental truck an electronic fume detector that could be tied into a national satellite network, to let investigators know what kind of materials the truck is carrying. For example, if the truck was carrying dynamite, the sensor would relay the message to the satellite that this truck is carrying hazardous material. In turn, the dispatchers could send the message to the Federal Bureau of Investigations who then would send the bomb squad to the location of the truck, and arrest the individuals driving and defuse the bomb. It seems as though terrorists choose to place the bombs in parking garages below or inside buildings. Another idea I have for this is to screen all vehicles entering government buildings that may be a target for an attack. This in itself might make terrorists more leery about entering a building carrying any type of explosive device. The use of metal detectors on people entering government buildings along with dogs that can sniff out bombs in vehicles can also help the situation. One of the most lethal types of terrorist attack are hijackings on planes. There have been a number of hijackings, which then lead to a bombing of the plane in midair. In 1986, a Pan-American Boeing 747 airplane blew up in midair killing all passengers aboard. One of the leading terrorist groups took responsibility for this action. Again in the late 1980's a Transworld airline flight was hijacked and made several stops before commandos rushed the plane and killed some of the terrorists. Unfortunately, the terrorists had taken several lives on the plane and even dumped one of the passengers that they had killed, out of the plane onto the tarmac. One of the problems with these type of terrorists is that, it is too easy to get a bomb into the baggage section, under the plane. This is easy for them, because unlike carry-on luggage, the actual luggage is not X-rayed for contraband.