The grounding of American Airlines Inc.'s MD-80 fleet in April cost Dallas/Fort Worth International Airport about $800,000 in landing fees, an airport official said Tuesday.

Max Underwood, the airport's vice president of finance, said the airport suffered a similar revenue loss in March from cancellations caused by bad weather, as well as the bankruptcies of ATA Airlines Inc. and Frontier Airlines Inc.

Through April 30, the first seven months of the airport's fiscal year, its revenue totals $380.4 million, $800,000 less than it had budgeted.

American estimated in mid-April that the groundings of about 3,300 flights in April for safety inspections decreased its revenue by about $75 million but has not put a final price tag on the incident. One analyst had projected that the MD-80 debacle will reduce parent AMR Corp.'s income by about $100 million.