CORRECTION: A story Monday about Mayor Nutter's travels should have noted that he paid his own way to Democratic conventions in 2008 and 2012 even as the city paid for the rest of his entourage. Also, his office said it erred in totaling the city's costs for the 2008 event at $10,014, saying the correct figure was $7,296 — making it the second costliest of the trips described in the article and a chart.