b'Jim Cramer and David Faber discuss the September slump for stocks, volatility continuing as wall street seeks to recover from the worst sell-off in 2 weeks. Goldman Sachs cuts its Q4 GDP outlook amid diminished hopes for a DC stimulus deal. Plus wild swings for shares Nikola continuing, the electric truck maker downgraded to sell at Wedbush.\\xa0And United Airlines becoming the first major U.S. airline to offer rapid COVID-19 tests for some passengers, what this could mean for the industry as a whole.'