US STOCKS-Wall St up for 6th straight week despite oil rout
* Oil falls to 2010 low, Exxon Mobil tumbles
* Airline shares rally on drop in crude prices
* Retailers higher, Wal-Mart boosts Dow
* Indexes notch sixth straight weekly advance
* Dow flat, S&P down 0.3 pct, Nasdaq up 0.1 pct (Updates to close)
By Ryan Vlastelica
NEW YORK, Nov 28 (Reuters) - U.S. stocks ended mostly flat in a holiday-shortened session on Friday as a massive decline in the energy sector offset strength in consumer names, but major indexes rose for a sixth straight week.
Crude oil fell below $68 per barrel a day after OPEC decided not to cut output, which could leave markets oversupplied. The 7 percent decline was the biggest one-day drop since May 2011, with prices lowest since 2010.
"Crude seems to have no floor right now, and we could easily see the price drop into the low $60s," said Tony Roth, chief investment officer at Wilmington Trust in Wilmington, Delaware. Continuación...