Hello, I had booked a flight on Delta in July, 2014, and realized I could not use it. I returned it within 72 hours, and apparently had one year to use the miles before they expired. However I just remembered this situation in September 2015 as I am seeking another Delta flight. Does anyone ever know of any leniency in this one-year expiration for miles? Just thought I would check with knowledgeable people like you all...