American Airlines has echoed rival Delta in downgrading guidance on first quarter revenue.
The loss per share in the first three months of the year is expected to increase on lower revenue.
Total revenue for the period is now projected to be flat year-on-year from a previously forecast increase of 3%-5%.
Chief executive Robert Isom cited “increasing macroeconomic uncertainty” combined with a softness in US domestic leisure travel, mainly in March.
Other factors included the impact of the midair collision between flight 5342 in and a US army helicopter in Washington DC which claimed 67 lives in January.
However, Isom told a J P Morgan industrials conference in New York on Tuesday that he does not expect a long-term financial impact on the industry “or our business”.
His comments came as investigators recommended restricting helicopters flying close to Ronald Reagan National airport (DCA) in the US capital.
The US The National Transportation Safety Board called for immediate changes, saying the current helicopter routes around the busy airport “pose an intolerable risk to aviation safety”.
The Bombardier CRJ700 regional jet operated by American Airlines’ subsidiary PSA Airlines from Wichita, Kansas, with 64 people on board, was about to land when the collision occurred on January 29. The three soldiers in the helicopter were conducting an annual training flight and night vision goggle check at the time of the collision.
American Airlines said: ”We continue to mourn the lives lost in the tragic accident involving Flight 5342. We’re grateful for the National Transportation Safety Board’s urgent safety recommendations to restrict helicopter traffic near DCA and for its thorough investigation.
“We will continue to coordinate closely with PSA Airlines as it cooperates as an investigative party member.”