By monitoring tiny fluctuations in the Earth’s magnetic field caused by a passing plane, a team of European researchers has developed an innovative system to increase airport safety even in the worst weather conditions. Using magnetic field detectors, a team of researchers, led by Uwe Hartmann and Haibin Gao of Saarland University in Germany, has developed a unique system to pinpoint the location of aircraft at airports even in places where other traffic monitoring systems face difficulties.