CHICAGO, Feb 25 (Reuters) - United Airlines, which last week avoided a possibly disastrous strike by mechanics, will resume talks on Tuesday to try to reach agreement with unionized ramp workers and others before asking all employees for wage concessions. United, a unit of UAL Corp. (UAL), remains in federally mediated talks with the International Association of Machinists and Aerospace Workers District Lodge 141, representing 24,000 of the airline's workers. "We are close, but an agreement is not imminent," IAM spokesman Joe Tiberi said Monday. "We are not expecting a resolution tomorrow." UAL reported an industry record $2.1 billion net loss for 2001 after a drop in air travel following the Sept. 11 attacks and a decline in lucrative business travel. UAL plans to seek several billion dollars in concessions from all employee groups in the months ahead. Labor costs are 38 percent of total expenses, levels unsustainable given the sharp revenue drop following the Sept. 11 attacks. Ramp, customer service, reservations, food service and security workers have gone without a raise in base pay since 1994, and their most recent contract became amendable in July 2000, Tiberi said. Another IAM district lodge represents United mechanics, who are set to vote March 5 on a tentative agreement reached last week that helped the No. 2 carrier behind AMR Corp.'s (AMR) American Airlines avoid a potentially crippling strike. "They are not at the same stage (in negotiations) as mechanics were, and these (talks) are going a lot smoother than the mechanics negotiations were," Tiberi said. United spokesman Joe Hopkins said there is no deadline on concessions. "The labor component is part of the financial recovery plan along with enhancing revenue and the financing component, but both of the IAM contracts have to be resolved first," he said.