Originally Posted by
Ijones027
18 hours and a overnight, I was reading somewhere that jal automatically checks it to the final destination under 24 hours and any chance I could get back the 10k points that it cost extra if I cancel the last leg?
Given that it's an overnight 18 hour connection I highly doubt it will be any problem for JL to check your bag only to HND. However that would ultimately be up to JL policy so you may ask over on the JL forum.
The only way you will get the 10k miles back is if you can get AA to change your award beforehand to just ORD-HND. If you keep the award as-is and just cancel the HND-HKG segment once you arrive in Tokyo then the miles would not be refunded.