Updated from 3 p.m. EDTUnited Airlines wants to cut labor costs by $9 billion over the next six years, a move the carrier hopes will stave off the need for bankruptcy protection and secure a handout from the government. But the company might not reach those goals if labor has a say in the matter. United, a unit of UAL ( UAL) and the world's second-largest carrier, unveiled an emergency restructuring proposal that calls for $2.5 billion a year in annual cost savings, with $1.5 billion of that coming from reductions in labor costs. Previously, United's pilots union had agreed to cut wages and benefits by 10% over the next three years, for a total savings of $520 million. But union leaders said the current proposal, which United needs in order to receive a $1.8 billion government-backed loan, goes too far.