U.S. President Donald Trump's administration is only hours old, but already a small parade of S&P 500 companies' chiefs have voiced optimism that his promised tax cuts, stimulus spending and deregulation will boost corporate profits. In the days ahead of Friday's inauguration, senior executives from Morgan Stanley , Delta Air Lines and other major U.S. corporations said the Trump White House has already sparked a brighter outlook for business. "There is certainly more reason to be optimistic as we enter 2017 than there was at the beginning of 2016," Morgan Stanley CEO James Gorman said on Tuesday after his bank said profit doubled in the fourth quarter.