Eight years ago, a twin-engine plane overshot the main runway of the Allegheny County Airport and crashed in a nearby trailer park, critically injuring the co-pilot, but sparing residents of the West Mifflin trailers.

Since then, the Allegheny County Airport Authority has been working to acquire the Broscius Trailer Park, just off Lebanon Church Road, and moving its 60 families to new locations, far away from the runway.

Though the process has been a slow one, JoAnn Jenny, spokeswoman for the airport authority, said the relocation of residents is complete and the authority is now getting ready to extend the safety area around the runway.

"All the mobile homes have been removed and some utility capping is going on," said Ms. Jenny.

For its work in relocating the mobile home community, Ms. Jenny said, the Allegheny County Airport Authority received an "Airport Service Award" on Sept. 15 from the Aviation Council of Pennsylvania.

"The recognition was for smoothly relocating people to other housing," Ms. Jenny said.

The aviation council consists of airports, corporate flight departments, air charter operators and other aviation organizations that work together to promote aviation interests in both the government and private sectors.

Even before the accident, the Federal Aviation Administration was pushing airports around the country to make sure the safety areas around their runways were as close to 1,000 feet as possible," Ms. Jenny said.

At the county airport, the Broscius Mobile Home Park was in a problem area, too close to the main runway.

On Jan. 6, 1998, a twin-engine jet trying to land in heavy fog at the county airport overshot the main runway and crashed into the mobile home park.

The pilot and co-pilot both survived the crash and no one on the ground was injured.

By 2003, the airport authority had established a relocation office at the airport terminal and was well on its way to helping families move.

The relocation was funded by federal and state money.

The process required an environmental assessment and involved both the state Department of Transportation and the FAA.

Ms. Jenny said about $7.5 million has been spent thus far to clear the land, buy several businesses and relocate trailer park residents.

Concrete Jersey barriers now line the former trailer park property along Lebanon Church Road.

She said next phase of the project is to fill in the area and do some planting.

"There's no cost estimate for this yet," Ms. Jenny said.