March 10 (UPI) -- Delta Air Lines on Monday slashed its first-quarter revenue and earnings outlooks, citing weaker domestic demand in economic "uncertainty." Expected revenue in the quarter ending March 31 will rise no more than 5% from last year, down from a forecast in January of 6% to 8% growth, the airline said in a filing with the U.S. Securities and Exchange Commission . Advertisement The adjusted profit forecast was slashed 30 cents to 50 cents per share from a previous guidance of 70