Last year, I was on a DL flight from DFW to MEM. The DL staff plopped a 5-year-old boy beside a passenger traveling alone, without saying so much as the child may need a little care. (It turns out his 6-year-old sister was in the seat behind, and dear sweet dad was in first class.) The boy was visibly shaken, crying and looking toward the FC cabin, and begging to go see his dad. The passenger beside the child entertained this kid, really cared for the little boy during the trip. (The kid had actually just flown from Hawaii to DFW.) This passenger went beyond the call of duty and showed true compassion to a scared and lonely little boy. Dad came by once to tell his children to get off the plane (less than 2 min). None of the FAs stopped by to check on the child or thank the passenger. More than a year has passed, and I still am angry at dad for his callous behavior and at Delta for letting these young children to be "alone." The caring passenger was great, and she deserves lots of appreciation that she never received.