They show up in Eastern USA because they were going to India before deploying to China.
The route by the early squadrons:
The B-29’s departed Pratt AFB [Kansas]for Gander Lake [Newfoundland, Canada]. From Gander, the route was to Marrakech, Morocco, non-stop over the ocean.
Then to Cairo, Egypt, Karachi, India, and the final destination, Chakulia, India
"After eight years as President I have only two regrets: that I have not shot Henry Clay or hanged John C. Calhoun."--1837