NEW YORK, Oct 28 (Reuters) - U.S. stocks extended gains on Tuesday and the Dow briefly rose more than 4 percent, as investors snapped up beaten-down shares. Hopes of an end to Boeing Co's (BA.N: Quote, Profile, Research, Stock Buzz) strike sent the planemaker's stock up more than 9 percent. The Dow's underpinning also came from a rebound in shares of energy companies, with Exxon Mobil (XOM.N: Quote, Profile, Research, Stock Buzz) up more than 5 percent after rival BP (BP.L: Quote, Profile, Research, Stock Buzz) posted a record profit. The Dow Jones industrial average .DJI was up 320.66 points, or 3.92 percent, at 8,496.43. The Standard & Poor's 500 Index .SPX was up 32.77 points, or 3.86 percent, at 881.69. The Nasdaq Composite Index .IXIC was up 56.15 points, or 3.73 percent, at 1,562.05. Stocks were higher after a report said U.S. consumer confidence plunged to a record low in October. (Reporting by Ellis Mnyandu; Editing by Kenneth Barry)

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