People are probably aware of this, but one should make sure the segments on Delta actually book in Business/Domestic First Class for the full 120 XP. As seen in the screenshot, segments [*within North America] on Delta seem to have a tendency to be booked in Y, even when connecting from long-haul J. Happened to me twice in the past when booking through an airline other then Delta (AF/KL), and it took some playing with dates to see all segments booked in J via ITA.