Bose's journey from Germany to Singapore by submarine was a well-remarked incident of World War II history. But what was the need for the Germans or the Italians to use a submarine to transfer a civilian? Was it impossible for them to arrange a flight? Or was it done to force Bose, whose relationship with Hitler was frosty, to make an uncomfortable and unsafe journey?
No, it wasn't possible to take a plane.
As I mentioned in the (currently accepted) answer to Which city was attacked by Nazi-German war flights in India during WW2? , the Nazis did not possess any plane capable of making a flight from German-controlled territory to India, much less Japan, without stopping for refueling, and they did not have any aircraft carriers.
Even so, airplanes in WW2 were not nearly as safe as they are today. Worse, they can be spotted, and if spotted in range of an enemy air field fairly easily taken down. This is, in fact, how the allies killed Admiral Yamamoto. So it is quite likely submarine transport would have been safer, even if air transport was an option.
In fact, the transfer to the Japanese sub occurred 10 days after Yamamoto was shot down. Its likely both Bose and the Imperial Navy wouldn't be inclined to risk another VIP that way so soon.
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