Shares of Boeing and American Express are posting losses Wednesday morning, sending the Dow Jones Industrial Average into a slump. The Dow /zigman2/quotes/210598065/realtime DJIA -0.38% was most recently trading 702 points (3.2%) lower, as shares of Boeing /zigman2/quotes/208579720/composite BA +0.40% and American Express /zigman2/quotes/203805826/composite AXP +1.61% are contributing to the blue-chip gauge's intraday decline. Boeing's shares are off $10.56, or 7.1%, while those of American Express are down $6.02, or 7.0%, combining for a roughly 112-point drag on the Dow. Also contributing significantly to the decline are Dow Inc. /zigman2/quotes/203121064/composite DOW -0.67% , JPMorgan Chase /zigman2/quotes/205971034/composite JPM +3.16% , and Goldman Sachs /zigman2/quotes/209237603/composite GS +0.80% . A $1 move in any one of the 30 components of the Dow results in a 6.78-point swing.