Planes were not as full for American Airlines in May.
The Fort Worth-based carrier said although its passenger traffic was 0.5 percent, its load factor on its planes was 81.9 percent, down 0.9 percentage points compared to May 2015.
American said it increased its capacity by 1.7 percent.
It also told investors it expects unit revenues to be down 6 to 8 percent for the second quarter.
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