Miles are sold before they are redeemed
Airlines commonly sell large quantities of miles to credit-card issuers, hotels, retailers and other partners. That creates cash revenue long before a member eventually uses those miles for a flight.
Redemptions create a future obligation
A mile is not pure profit when it is issued. The program must account for the expected cost of future redemptions, whether that means an award seat, an upgrade or another reward.
Unsold seats can be valuable award inventory
A seat that would otherwise depart empty may have a relatively low incremental cost to fill with an award traveler. Programs try to balance that opportunity against the possibility of displacing a passenger who would have paid cash.
Breakage improves the economics
Some miles expire or are never redeemed. That unused balance, often called breakage, reduces the ultimate cost of points that were previously sold or issued.
Loyalty can influence profitable behavior
Status tiers, co-branded cards and bonus offers are designed to keep travelers inside one airline group or alliance. The value is not only the points themselves but the repeat business they can encourage.
The program can matter to the airline's valuation
Because loyalty revenue can be recurring and partner-funded, a strong program may be one of an airline group's most valuable assets. Its economics can look different from the more cyclical economics of operating aircraft.
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