This one is interesting. I trawled through the SQ/KF T&Cs and nowhere was it mentioned what "actual miles flown" means or how it's calculated.
All that's mentioned is that the
Accrual Calculator can be used, and for that itinerary the "actual miles flown" is 9,925 miles (damn these Imperial units, gah). Anyway,
GC Map does state that the distance (as the crow flies) from SIN to IAH is 9,930 miles. You and I both know that you actually flew
SIN-MAN-IAH which is 11,523 miles. That's a LARGE difference. Damn.
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Worth chasing this one up, as even the T&Cs don't mention the calculation method - which is crucial. I'm sure one of the main blogs (Mile Lion, Mainly Miles, etc) would have covered it as it is a glaring gap in their system (I would be furious as would you), so yeah, let us know how you go, OP.
EDIT:
This might help,
@minesapint. It's from a long time ago, but similar sort of question (except for that OP it was PER-SIN-JFK but the SIN-JFK segment is actually SIN-(FRA)-JFK due to SQ26 using this routing (and a fifth freedom in there too, similar to your SIN-(MAN)-IAH. In that case it was only a roughly 1.5k mile difference, different to yours which is a bit more.
Anyway, it seems to be a result of the two flights using the same flight number, therefore the system only looking at the origin (SIN) and final destination (IAH), and discarding the extra MAN stopover/transit/whatever.
If it's a J ticket then there's quite a big difference in miles earned, plus any Elite bonuses (KFES or KFEG at 25% and 50% respectively). I would definitely follow this up, there's no "T&C" that they can fall back on, and the words actually used are "actual miles flown", which any "reasonable" person would interpret to be the physical distance flown by the plane for that journey.
Interesting how it hasn't been more reported on (similar to the cough BP situation at MEL but I'm not going to mention that point any further for fear of being crucified)...
Maybe start off with a
Kris the chatbot chat (so you have something in writing), and then can escalate as and when needed.