Route notes
Why this routing works
This itinerary is structured as a Pacific outbound from San Francisco to Tokyo, followed by a return from Bangkok to San Francisco. The long stay in Tokyo at the front of the trip and the longer stay in Bangkok at the end create two fixed anchors, with Vietnam placed in the middle as a shorter transition segment.
A key logistics feature here is the open-jaw between Tokyo and Da Nang, shown by the double slash in the routing. That means the trip leaves Japan and resumes in Vietnam rather than flying directly between those points on the ticket. From Da Nang, the routing continues onward to Nha Trang and then Bangkok, keeping the Southeast Asia portion moving in one direction before the transpacific return.
At 10 weeks in business class, this is a comfortable long-duration multi-stop plan that balances a small number of flight sectors with extended ground time. With departure in October and travel spanning the oct-dec season, the ticketing is set up around a single outbound across the Pacific, an intra-Asia sequence, and one final long-haul flight home.