He said salaried employees were being offered two weeks' pay for every year of service with the company.
Most people who work at these agencies are salaried employees.
United has not decided who among its management and salaried employees will be laid off.
Salaried employees, including most management, will be retained by the new company.
Salaried employees were able to make up the lost time by working extra hours in subsequent weeks.
As part of the deal, Northwest said, salaried employees will take cuts worth $35 million.
About 2,300 salaried employees have been filling in for the striking workers.
In 1925 the building was moved to its present location to serve as housing for single male salaried employees.
The centers' services will be available to more than 300,000 people, not just union members, but also salaried employees and retirees.
General Motors offered salaried employees paid leaves of up to 15 months, after which they would have to leave the company.