Since I have no experience with my booked trip, my trip is San Francisco (U.S.)> Haneda(Japan then Narita(Japan)> HCMC(Vietnam). Online resources said I have to transport between Haneda International Airport and Narita International Airport. My layover is only 5 hours.
What do I need for transportation? How can I get from Haneda to Narita?
If anyone can give me some advice, I really appreciate it.