March 29 (Reuters) - United Airlines Holdings Inc had reached tentative agreements with the International Association of Machinists and Aerospace Workers (IAM) for providing improved wages to its nearly 30,000 ground workers, the trade union said on Wednesday.

The detailed terms of the two-year contracts were not disclosed but the union said it offers "industry-best" wage rates, better job security, insourcing of five previously outsourced locations and prohibiting outsourcing at 17 additional U.S. locations.

The pacts come as a part of airlines' efforts to retain workforce with attractive pay after a faster-than-expected rebound in the U.S. travel demand following the COVID-19 pandemic, which recorded steep jobs cut in the industry.

IAM District 141 members covered by the tentative agreements would receive more details, the union said in a statement adding that a ratification vote would be shortly scheduled.

The agreements cover seven different work classifications at the carrier, including fleet service workers, passenger service workers, storekeepers, central load planners, maintenance instructors, fleet technical instructors and security officers. (Reporting by Nathan Gomes in Bengaluru; Editing by Shweta Agarwal)