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Thanks, your narrative is looking cohesive. Maybe just after Stanley got into Seattle she went right over to her old friends house. Makes international traveling sense -- what a weary travel -- Kenya to someplace in Europe, then to some east coast hub, then to Sea-Tac. Maybe more than a whole day of flying. The warmth and comfort of a dear friends house is well-sought, a need!
Wikipedia (cringe to use, but here's more spaghetti against the wall) says the follwoing about Sea-Tac of that time:

The runway was lengthened twice, first in 1959 to allow use by jets, and again in 1961 to handle increased traffic for the upcoming Century 21 World's Fair.

Had to put in the part about Sea Tac.

I suspect when we get the airline data, we won't see the trip as having been through Europe and the East Coast. If my memory is correct, Vancouver BC was the Commonwealth airline hub in Western North America--flights from all over the Empire arrived there.

And that fits with another reported girl friend interview that says Ann was out of the country when he was born--she remembers in Canada.

Yes Vancouver seems to have been a hub too. Yet 1961 Vancouver was considering the cost of upgrading the airport to the jet age. So who knows? Stanley could have traveled by prop/turbo-prop.

According to http://www.vancouverhistory.ca/chronology1961.htm:

The switch by the world’s airlines to jets would mean a major overhaul of Vancouver International Airport. A figure of $100 million was cited. The city voted to sell the city's share of the airport to the federal government for $2.5 million.

The Canadian government expansion of the airport for the jet age began in 1962. It is 232 km from Vancouver to Mercer Island according to Google Maps.

BOAC, British Overseas Airways Company, 1960 world-wide route map.

It's a lot of hops. Main BOAC planes in 1960s were the Bristol Brittania and the Comet. BOAC had its first delivery of 15 Boeing 707s in 1960.