Fig. 2From: Capability of airline jets as an observation platform for noctilucent clouds at middle latitudesFlight routes and summary of the NLC observations conducted on 13 flights in the Northern Hemisphere during the summer 2019 (see Table 1). Gray and black circles on flight routes show the locations without and with a possibility of NLC detection, respectively. Red circles show locations from which NLCs were successfully detectedBack to article page