Which innovative loyalty program feature did Delta Air Lines pioneer in 2021 that changed how airline miles work in the transportation industry?

Airlines, railways, and rideshare companies are constantly innovating their customer loyalty programs to retain customers in the competitive transportation industry. These programs have evolved far beyond simple point accumulation systems to become sophisticated engagement tools with unique features. Test your knowledge about the lesser-known aspects of transportation loyalty programs that have revolutionized customer retention in the industry.

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Miles that never expire, regardless of account activity
Status match guarantee with competing airline programs
Miles as currency that can be used to pay for TSA PreCheck
Transferable miles between family members without fees