Falling domestic yields and several one-time items will hit American Airlines’ bottom line this quarter, the carrier revealed July 11.

The Dallas/Fort Worth-based airline, updating investors ahead of its second-quarter earnings release on July 26, said total revenue per available seat mile will go up 1%-3% year-over-year (YOY), rather than 1.5%-3.5%, per its April guidance. “This change from previous guidance is due to lower-than-anticipated domestic yields,” American said.

Elsewhere, the crew-scheduling problems that disrupted regional subsidiary PSA Airlines cost the company $35 million in pre-tax income. The issue forced PSA to cancel about 3,000 flights in mid-June.

American said its second-quarter CASM increase is expected to be 2.5% YOY, or 1% lower than expected. Lower-than-projected maintenance costs and higher-than-expected airport rent returns helped keep costs down, the carrier said.

Sean Broderick, sean.broderick@aviationweek.com