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A site with information on the "hump" operation.
FLYING THE HUMP
A few highlights;
"In July, 1945, 77,306 tons of supplies were flown over the Hump to China. At that time the ATC was operating 622 aircraft, supported by 34,000 U. S. military personnel and 47,000 civilian personnel."
That is an average of 124 tons per plane per month. And at this point many/most of the flights were going over the southern "low hump" with most missions not going over 12,000ft. This total tonnage may include cargo flown in by other commands on occasion.
Cost was----" Official records of Search and Rescue were closed at the end of 1945. Their final records showed 509 crashed aircraft records "closed", and 81 lost aircraft still classified as "open". Three hundred twenty-eight (328 ) of the lost aircraft were ATC. Thirteen hundred fourteen (1,314) crew members were known dead, 1,171 walked out to safety, and 345 were declared still missing."
Granted the "high hump (15-16,000ft)" had not only high altitude but bad weather conditions and a longer, more circuitous route may have lost fewer aircraft per mile flown but at the cost of thousands more miles flown per ton of of cargo delivered.
the german "blitzkreig" concept would be no existant in a war like this. they would have no choice but to model their airforce and army along different tactics and strategies.
You also had two "China's" even before WW II started. The Communist party and the Nationalists (or what would become the Nationalists) plus more than few somewhat independent warlords. An outside country sort of had to pick which one they were going to ally with and plan supply routes accordingly as they two groups did NOT share well even when co-operating to defeat the Japaneses. Trying to transit hundreds of miles of the other groups territory could mean large percentages of the supplies going missing. The Communists tended to be in the North and the Nationalists in the South. In part perhaps because the Communists were supported more by the Russians? There tended to be a fair amount of hording of supplies to be used against each other rather than the Japanese.
Freya was demountable and participated in the 1938 Sudeten crisis in Czechoslovakia and one was flown by Ju 52 and erected during Fall Gelb, the invasion of Norway, that arose when Vidkund Quisling informed Hitler that the Norwegian Cabinet had decided to surrender to Britain when the UK's pre-emptive strategic invasion of Norway occurred.
Actually the Japanese have a better chance of "invading" California. Stick a bunch of troops on merchant ships, sail to California and unload/invade (best done before Pearl Harbor). Actually being able to sustain the invasion force/succeed is another story.
Maybe a throw-away idea, but the thought came up regarding using Zeppilins for long-range transport hauling. With WWII never starting, and a different German government in power, the Zeppelin program may not have been dismantled. Logistically speaking (at least in terms of fuel, range, and operational costs) airships break away from a lot of the limiting factors for large, long-range heavier than air transports.