Or - what might be the most expedient ways for the WAllies (ie. UK ad USA) to start producing combat-worthy jet aircraft for use in ww2? Be it fighters, bombers, recon aircraft? The 'task' starts in winter of 1938/39, and it will obviously need better funding for jet engines themselves in order to bear fruit. A jump to swept wings is not required on such an early date, but can be viable for late war.