The pilots' union said it would consider concessions.
The pilots suggested that they and other employees consider concessions in return for majority control of United, and United's management responded with interest.
As a result, they, too, will be forced to consider concessions.
Union leaders have refused to consider cost-saving concessions until they see a complete long-term plan to solve the city's fiscal problems, including help from the state.
Only the pilots' union has agreed to consider further concessions.
Yesterday, the mechanics considered concessions of $349 million a year over six years.
Wednesday Mr. Thomas finally offered what he considered major concessions.
City and labor officials reported that unions were, for the first time, considering concessions including a rollback of wage increases.
Both sides seemed willing to consider concessions in London that would bridge the remaining differences over the American withdrawal proposal.
If he makes what the administration would consider concessions, he would confirm its view that only pressure can move him.