CHARLOTTE, N.C. ( TheStreet) -- US Airways ( LCC) says that 299 workers at subsidiary Piedmont Airlines will lose their jobs as it downsizes at New York's LaGuardia Airport.

In a filing with the New York State Department of Labor, the carrier said that 299 customer service agents and fleet service workers will lose their jobs in two stages: on March 25 and on July 11, 2012.

In a recently completed deal, US Airways traded 132 slots at LaGuardia to Delta ( DAL - Get Report) in exchange for 42 slots at Washington Reagan National Airport.

"As a result of the transaction, which has been in the works for years, we are faced with the tough decision to eliminate some jobs at LaGuardia," said US Airways spokeswoman Michelle Mohr.

Piedmont Airlines, based in Salisbury, Md., provides ground services for US Airways at various airports, and also operates a fleet of Dash-8 turboprops. Mohr said no layoffs are expected for Piedmont flight attendants or pilots. Next week, US Airways will announce its plans to increase flights and add jobs at Washington National, Mohr said. It is unclear whether Piedmont Airlines will pick up new flying at National.

Delta said last week that it will add about 700 jobs at LaGuardia as it adds flights. It is not unreasonable to assume that Delta would hire some of the agents and ramp workers let go by Piedmont. "We are still putting together our plans for staffing up at LaGuardia," said Delta spokesman Trebor Banstetter.

-- Written by Ted Reed in Charlotte, N.C.

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