Why airline loyalty doesn't pay off like it used to

iStock; Rebecca Zisser/BI

• Airline rewards programs have faced scrutiny over dynamic pricing and devaluation practices.
• Frequent flyers feel burned as airlines adjust rewards, and the DOT is investigating.
• Dynamic pricing can affect point values, leading some customers to prefer cashback over miles cards.

Sean Brown, 46, has logged close to 2 million miles on Delta, his preferred airline. But his loyalty is waning as dynamic pricing and devaluation practices...