Hobart is one of many suppliers that dot Boeing's home turf around Puget Sound in Washington state, and the Bresters had planned to double their four-person workforce to meet Boeing's ambitions for increased production of its best-selling 737 jets. Hobart supplies parts to larger companies that sell directly to Boeing. Those plans are now up in the air after U.S. regulators curbed Boeing's production following a mid-air jet panel blowout, and the Bresters are not alone.