Behind strong returns for shares of Chevron and American Express, the Dow Jones Industrial Average is rallying Monday morning. The Dow DJIA, +1.29% is trading 333 points (1.2%) higher, as shares of Chevron CVX, +3.18% and American Express AXP, +2.84% have contributed to the index’s intraday rally. Chevron’s shares have risen $2.40, or 3.3%, while those of American Express have gained $2.52 (2.6%), combining for an approximately 32-point boost for the Dow. Also contributing significantly to the gain are Boeing BA, +4.71%, Dow Inc. DOW, +2.56%, and Walgreens Boots WBA, +2.35%. A $1 move in any of the index’s 30 components equates to a 6.58-point swing.