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Thread: Online check-in: What's a 'half-width character?'
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Old Apr 20, 2014 | 6:32 pm
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armagebedar
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Half-width vs full-width refers to different types characters used in CFK languages (the explanation is long and involved, so I refer you to Wikipedia).

However, I don't think that's applicable in your case. Have you tried calling JAL (or your travel agent) to input it for you? To be honest, it's not really a big deal -- they'll confirm your passport details again at check-in -- so I think you're right in waiting until you get to NRT to do so.
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