They say June 8 is seisoken hakken no hi(成層圏発見の日), Day of the discovery of the stratosphere. The French meteorologist Leon Philippe Teisserenc de Bort discovered the stratosphere in 1902 by experiments of using balloons. The stratosphere (成層圏：seiso ken, 11km-50km) is the second major layer of Earth's atmosphere, just above the troposphere (対流圏：tairyu ken, 0km-11km), and below the mesosphere(中間圏：chukan ken, 50km-80km).
Commercial airliners usually cruise at altitues of 9-12km in temperate latitudes, in the lower reaches of the stratosphere. There is no clouds there and it is fine always.
When I found it was fine above the clouds while I was on the airplane, I was so impressed.
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