A friend wants to know if compensation/miles refund may be due. I hope the following parameters will be all that are needed for intelligent analysis: (1) He used 25000 miles for an F award from DCA-DFW-SAN. (2) The DCA-DFW was cancelled, with the announced cause being pilot illness (I don't know if this is an "excusable" cause for cancellation). (3) It was a Friday evening, and AA could not rebook him that evening and would be unable to get him to SAN until noon Saturday, which was a significant problem. (4) AA managed to get him into Y on DL arriving that Friday in SAN a bit later than the original itinerary, but not meaningfully later. Seats were centers. Was wondering, what with the downgrade, if he should anticipate any compensation?