American Airlines says traffic and a key revenue measure both declined in April.
Fort Worth-based American said Wednesday that passenger revenue for each mile flown by every seat on its planes fell 2.9 percent from April 2012.
Combined with declines at other carriers, the American figure suggests that carriers aren't selling as many high-fare tickets as they did a year ago.
The same statistic declined 4 to 5 percent at Dallas-based Southwest Airlines, 4 percent at US Airways, 2 percent at Delta Air Lines and was flat at United Airlines in April.
Traffic on American and regional-flying affiliate American Eagle fell 1.1 percent. American and Eagle increased their passenger-carrying capacity by 0.4 percent in April.