Dow closes at record high after Fed leaves rates unchanged

USA stocks hit record highs Wednesday morning, with all three major indexes reaching never-before-seen levels.

The Dow in particular is enjoying a boost from the latest batch of earnings, with Boeing (+7.5%) and AT&T (+4.7%) up sharply after both companies beat earnings estimates; Boeing also raised its FY 2017 earnings guidance.

Social media giant Facebook, and aerospace and defense corporation Boeing, saw their stock prices soar after their earnings for the second quarter of this year came strong on Wednesday and Tuesday, respectively.

"The dollar, which was a headwind earlier, is now looking like a tailwind. Right now, the path of least resistance is higher".

Stocks were also driven by the US Federal Reserve's announcement that it would maintain interest rates at 1-1.25 percent.

That sent the dollar index .DXY to a 13-month low against a basket of major currencies.

At 9:43am ET (1343 GMT), the Dow Jones Industrial Average was up 64.76 points, or 0.3%, at 21 775.77 and the S&P 500 was up 3.18 points, or 0.12%, at 2 481.01.

The Dow was up 0.4% and climbed to a record high.

Twitter TWTR.N was down 11.98 percent after the company's quarterly results showed it failed to add users on a monthly basis in the second quarter, compared with the first quarter. On the Nasdaq, 1 177 issues rose and 1 154 fell.