American Airlines AAL.O jumped 3% after it forecast positive cash flow. By Noel Randewich and Devik Jain July 14 (Reuters) - Wall Street saw choppy trade on Wednesday, with the S&P 500 reaching a record high and the Nasdaq edging lower as investors balanced worries about inflation with reassuring comments from Fed Chair Jerome Powell. U.S. monetary policy will offer "powerful support" to the economy "until the recovery is complete," Powell told a congressional hearing in remarks that portrayed a recent jump in inflation as temporary and focused on the need for continued job growth.