Another wild day on Wall Street Wednesday with the Dow Jones Industrial spiking 100 points in the last half-hour of trading to give it up on news the European Central Bank will no longer accept Greek bonds as collateral for loans. The Dow closed flat but managed to squeeze out a small gain. The S&P 500 and Nasdaq finished with losses. Crude oil, once again led the markets but this time to the downside. Oil prices sank almost 9% to settle below the $50 mark. Exxon Mobil (XOM) and Chevron (CVX) closed lower. But airlines including United Continental (UAL), American (AAL) and Southwest (LUV) soared on tanking oil prices. Disney (DIS) can be credited for the Dow closing in the green. Shares jumped nearly 8% after a spectacular earnings report.