Plans for production version included replacing 2 bug-eye canopies with single canopy (as on second XB-43). XB-43s performed quite well. Second XB-43 delivered to Muroc Lake May 47 and used as engine test bed. One J35 engine replaced with a GE J47 and was kept flying by cannibalizing first XB-43 which was damaged 1 Feb 51. Late 1953, second XB-43 retired. By then, newer jet bombers were on drawing board (including B-45 and B-47) and USAF dropped further consideration.