SEATTLE, Feb 4 (Reuters) - Boeing's ( BA ) key supplier

Spirit AeroSystems ( SPR ) has a substantial inventory of 737

fuselages of significantly improved quality that are ready to

ship, an executive with the planemaker told a Seattle aerospace

conference on Tuesday.

The U.S. planemaker has been working to grow production of

its 737 MAX jet to a monthly rate of 38 this year after

drastically curbing output in 2024 following quality concerns

after a mid-air panel blowout on a near-new model.