Really interesting and exciting thing happened to me last week. Was flying from SNN-EWR in economy. Gave crew chocolates on boarding (have a friend who is a FA for AA and appreciate how tough their job can be) and complimented the lead FA having seen her being really kind and helpful to a frazzled mother of 4 on a flight from EWR-SNN 3 months previous. Anyway, took my seat and shortly before doors closing she came down the aisle and gestured for me to come to the galley-she explained that a man in BF had bought a 2nd seat and asked her to give it to someone in economy-and she asked me if I would like it! Needless to say I was super excited and took her up on the offer! Was seated in 2F-she told me where the man was seated (row 1) and I met him during the flight to thank him and again when disembarking-he simply replied both times that he was happy I enjoyed it. What a great treat it was .