AA canceled our flight which we had booked in April for Jan-Feb visit. After getting reimbursed by AA I tried to use FF miles on Delta. No flight available for FF, so I bought the tickets from Flint, Mi to AUA for $585 pp. I checked Delta today and the cost dropped $140 pp. Called Delta and they said to rebook would be $150 pp. Said I just wanted a credit for the difference. Told me they would have to rebook and charge me $150 pp. What a load of crap! There ought to be a law. No regular local business could get way with that. Talked to 2 supervisors and got the same bs. Just wish I could do something-so frustrated.