PHILADELPHIA — Pope Francis kissed the forehead of a boy with cerebral palsy after landing in Philadelphia on Saturday morning, coaxing a small smile from the severely disabled 10-year-old. Francis apparently spied Michael Keating as he was being driven away from the plane. Ordering the Fiat to stop, Francis got out and walked over to the boy, put his hand on his head and kissed him as his sobbing mother looked on. Kristin Keating thanked the pope, who grasped her hand.