aircraft people at Polarstern and vice versa that of the PS-people at the airport had to be planned. We also organized a get-together for the evening of Wednesday of both the Polarstern and the aircraft [...] Sea ice extend, Polarstern position and measurement time - This year the sea ice extended more to the south than in the years before. Therefore, it was feasible for us to reach Polarstern with Polar 5 and [...] prevailing northerly winds. Collocation with Polarstern and Ny Ålesund - We actually succeeded ten times to perform collocated measurements with both aircraft, Polarstern, and partly with observations from an