Originally Posted by
Markus 9643
The oneworld explorer does not allow backtracking, you can go west or east.
The flight vom Haneda to singapore and back to narita is not allowed in the ticket
That is incorrect. The backtracking rule applies to backtracking between TC zones. You can zigzag and backtrack within continents with a few exceptions, e.g. Hawaii and mainland North America. HND-SIN-NRT is perfectly okay.