The freight Boeing-757 of the DHL company, which collided over Germany with the Tu-154 airliner, was not possibly fitted out with the equipment necessary to prevent clashes in the air.
According to the rules of the US federal aviation service, all passenger planes in the United States are equipped with such systems, but these rules are not applicable to freight planes. When the pilot discovers that another plane nears his plane, the system switches on and warns the pilot of the necessity to change the course.
As the Internet site of the DHL company says, the company's old Boeing-727 planes were replaced by forty-four Boeing-757 planes within the framework of a programme to extend air traffic in Africa and Europe.
The choice of the city of Helsinki is not incidental as the capital of Finland had hosted US-Soviet negotiations on the limitation of nuclear stockpiles in 1969