Nice map. Great work.
My memory was that the Glaskow flight was direct out of Vancouver; and that there was a one stop connection to Africa. Maybe later. An old friend of mine from opposing high school football, a trial lawyer in later life, took depositions in Khartoum in the early sixties and got there by flying to Vancouver.
Reason the second airport picture shows the change to San Francisco is that they were catching the SF flight on BOA to catch the connection to Van and Nairobi (hypothetically).
People who went to British Africa from the states took one of these routes--from the West Coast, through Vancouver.
So having done that much work, I wonder if flight passenger information is available from December 1, 1960 to January 20, 1961? Probably long gone?
Not much work, I just googled. That flight passenger info, though ... don’t know. But these trips were be international travel — some of which might have needed visas. Would you know? Maybe not in 1961 when Kenyan was a British colony, but after 1963 when it became independent?