U.S. stock index futures turned positive on Monday as analysts were optimistic about the holiday sales season and as concerns about a possible debt default in Dubai eased.

S&P 500 futures rose 2.7 points and were above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures gained 20 points, while Nasdaq 100 futures added 5.25 points.

(Reporting by Edward Krudy; editing by Jeffrey Benkoe)