I like the 1945 start date idae, Id like to see this date in the far east. Japan had a high traffic rate due to the USA occupation plus repatriation from WW2 , the British empire was imploding causing rapid changes in traffic around India. Then there are the restrictions that would come into play with the French Indo china war and later the Vietnam war. with its massive increase in traffic during the Vietnam war. loads of fluctuation in demands during the 1945- 1975 time frame demanding constant route and passenger changes rather than the usual slow climb in demands and routes also an interesting time for new aircraft coming into play.