It's shaping up to be one of the most unpredictable travel seasons in years. The ongoing U.S. government shutdown has […] The ...

Contrails in the blue sky remind us of daily air traffic – and its impact on the climate. However, the effect of contrails on the climate is still only partially understood. It is assumed that they ...

Long-lived contrails form predominantly not in cloud-free skies, but within already existing ice clouds. This is the ...