I’m looking at a Wikipedia List of World War II conferences:
Winston Churchill travelled to North America to attend conferences with the allies on numerous occasions, starting in the summer of 1941. Churchill also travelled to Moscow in 1942. FDR travelled to Cairo, Egypt, in November of 1943.
I wonder how the logistics of getting Churchill and FDR to these locations worked in the middle of the great war. Security-wise, these trips must have been the nightmare to end all nightmares. Did Churchill and FDR travel by plane and which route did they take, how many escort planes (ships) were there, did they prepare emergency landing sites? What was the level of secrecy?