Just four months after issuing the tanker requirement , the USAF ordered the first 29 KC - 135s from westjet rocks the DC - 8 project , Douglas decided that it was better to press on than give up .
Just four months after issuing the tanker requirement , the USAF ordered the first 29 KC - 135s from Boeing . 
 Having started on the DC - 8 project , Douglas decided that it was better to press on than give up .