<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by PointWeasel:
Now I'm confused!?!? Without a NRT-DEN non-stop then you would have to connect thru either SEA, SFO, LAX or even ORD, right? </font>
NRT-SEA-DEN is sold as a through flight (one-stop, same flight number) UA 876.
However, this can also be booked as two segments. Since mileage is calculated based on the distance between two points on one FLIGHT NUMBER (not origin/destination), if one books NRT-DEN via SEA as one flight number (one-segment with change-of-gauge), the mileage from NRT-DEN might be less than booking NRT-SEA then SEA-NRT. For this and other reasons, some people like booking it in separate segments as well.
Also, as someone noted above, booking NRT-SEA-DEN as one through flight actually means that the entire itinerary must clear for upgrade - i.e. it's treated as "one flight" in order for the upgrade to come through. For this reason, one might prefer to book it as two flights instead of one.
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