Boeing's largest union on Tuesday urged the planemaker's new CEO Kelly Ortberg to get more involved in resolving a strike by around 33,000 U.S. West Coast workers, after their healthcare benefits were cut.

Boeing is making what it calls a "best and final offer” to striking union machinists, but the union says it won't vote by Boeing's deadline

Boeing employees still working received a notice on the furloughs Wednesday, which noted that it will encompass tens of thousands of nonunion employees for the duration of strike.