A combination is one fare (or no sale at all), an optional
miles payment on an upgrade, and any subset of the add-ons
that fare can carry. Every valid one is generated and scored;
nothing is hand-written.

final = 100 × ( wcv·customerValue + wconv·conversion
              + wrev·revenue + wloy·loyalty )

match         = base utility of the fare
              + Σ over every part in the package:
                  weight × (score signal − 0.5)
                  weight × P(yes)
                  0.25 × trip-priority  +  0.15 × intent
              + 0.8 × P(asked for this cabin by name)
              + 0.45 × fit of anything the fare already includes
              − 0.12 per add-on the customer showed no interest in
              − 0.6 × P(refusing extras), on every upsell
              − 1.2 × (1 − affordability) × min(1, unasked $ ÷ 250)
customerValue = match ÷ best match in this customer's set
affordability = Σ P(price level) × min(1, budget[level] ÷ unasked $)
                budgets by level: any · $130 · $45 · $0
                unasked $ = price, less 75% of anything asked
                for by name (that price is not a surprise)
conversion    = ( 0.10 + 0.35·readiness + 0.55·affordability
                  + 0.2·(upgrade propensity − 0.5) for upsells )
                × 0.85 ^ (unwanted add-ons in the package)
                × (1 − 0.8 × service mode)
                "No sale" converts at the service-mode rate.
service mode  = P(complaint) + P(cancel or refund)
                + 0.8 × P(special assistance)
revenue       = conversion × ( fare margin + Σ add-on margin ×
                how much the customer wanted it ), ÷ the best in
                the set. An unasked add-on earns nothing.
loyalty       = strongest gesture in the package
                × (0.5 + 0.5·loyalty value)
              + service recovery × P(complaint)
                a perk only earns loyalty if it was wanted

Add-ons carry no base utility, so stacking them cannot
inflate a score. Eligibility is a hard rule from the record,
applied to parts before any combination is built.
Click any package to see its own terms.