The vast majority of B-47 losses seem to be during take off & landing, mid airs are many, as is stalling (a particularly wild ride as wing flex caused crew to be bounced around), particularly while in flight refueling. Being crewed with 500 hour pilots adds to the mix. Structural fatigue was an issue as the science was in its infancy.
http://b-47.com/wp-content/uploads/2...-Ejections.pdf