Originally Posted by
sbm12
As for credit earned, you only get the point-to-point miles and the one point, not the bits from each segment. CO 6/7 operate from SAT to GUM via IAH and NRT with three different planes.
The mileage credit difference is 15%. That's a pretty bad one to book as the direct flight number from a credit perspective.
You can always book the same-flight-numbered flights as separate flights. For example, I booked the flight from IAH-NRT and booked an additional NRT-GUM on the same itinerary. You pay a few dollars more for security/airport fees, but you get to earn the mileage you deserve.