Walgreens Boots Alliance Inc  NASDAQ WBA  declined 3.16  or 0.76 points to end at 23.27 and  Boeing Co   NYSE BA  shed 2.23  or 4.96 points to 217.70.The top performers on the S&P 500 were Cognizant Technology Solutions Corp Class A  NASDAQ CTSH  which rose 4.13  to 77.97, Bank of New York Mellon  NYSE BK  which was up 4.02  to settle at 54.85 and  Northrop Grumman  Corporation  NYSE NOC  which gained 2.94  to close at 481.08.The worst performers were United Airlines Holdings Inc  NASDAQ UAL  which was down 10.63  to 39.78 in late trade,  American Airlines Group   NASDAQ AAL  which lost 9.46  to settle at 13.21 and Delta Air Lines Inc  NYSE DAL  which was down 8.97  to 38.47 at the close.
Walgreens Boots Alliance Inc. and Boeing Co. declined, while Cognizant Technology Solutions Corp Class A, Bank of New York Mellon, and Northrop Grumman Corporation were the top performers on the S&P 500. United Airlines Holdings Inc., American Airlines Group, and Delta Air Lines Inc. were the worst performers.