Shares of Delta Air Lines Inc DAL.N dropped 3.5% as the company forecast first-quarter profit below expectations. By Caroline Valetkevitch NEW YORK, Jan 13 (Reuters) - The S&P 500 and Nasdaq finished at their highest levels in a month on Friday, with shares of JPMorgan Chase and other banks rising following their quarterly results, which kicked off the earnings season. Also giving some support to the market Friday, the University of Michigan's survey showed an improvement in U.S. consumer sentiment, with the one-year inflation outlook falling in January to the lowest level since the spring of 2021.