U.S. President Donald Trump plans to announce the most ambitious tax reform plan since the Reagan era in the next few weeks, the White House said on Thursday, sending stock prices and the dollar higher on hopes for a cut in corporate tax rates.

In a White House meeting with airline executives, Trump promised a "phenomenal" tax plan, but offered no specifics other than citing the need to a lower tax burden on businesses.

"That's coming along very well. We're way ahead of schedule," the president said. "We're going to be announcing something I would say over the next two or three weeks that will be phenomenal in terms of tax and developing our aviation infrastructure."