American said it would boost service to parts of the US where demand was strongest, including Florida, North Carolina, Georgia and South Carolina.
But American, which has a higher debt level than other leading US carriers, said it had an average of 110,330 customers in late May, more than three times the level from April.
Major airlines have been slashing service and encouraging flying staff to take unpaid leave to try to conserve cash after demand dropped by as much as 95 percent as the pandemic hit.
Citing increased interest from consumers in US states that have reopened more quickly from coronavirus shutdowns, the major carrier will fly 55 percent of its domestic schedule in July and nearly 20 percent of its international schedule.
American Airlines will boost service to parts of the US where demand was strongest, including Florida, North Carolina, Colorado and Utah American Airlines will add more flights in July on improving demand, the company said Thursday, suggesting the industry had seen the worst of the hit from the coronavirus shutdowns.