1) Loyalty programs have evolved from simple merchandise and coupon-based programs to complex frequent flyer mile programs run by airlines and banks.
2) Frequent flyer miles proved highly successful at rewarding desired customer behavior and driving long-term loyalty because they offered an aspirational travel reward.
3) Over time, generic points programs emerged that offered unrestricted airline rewards through a single network, rather than individual airline programs, appealing to customers through increased reward attainability.