Many company customers made use of Navistar - sourced chassis for the Blue Bird Conventional , in 1995 .
Navistar became the parent company of Blue Bird competitor AmTran ( IC Corporation in 2001 ) .
Although many company customers made use of Navistar - sourced chassis for the Blue Bird Conventional , in 1995 , Navistar became the parent company of Blue Bird competitor AmTran ( IC Corporation in 2001 ) .