Once service testing was complete, the Y1B-17s and Y1B-17A were redesignated B-17 and B-17A, respectively, to signify the change to operational status.
在所有的作戰測試皆完成之後，Y1B-17跟Y1B-17A被重新編號為B-17與B-17A，表示該機型已進入作戰序列之中。