Bell teamed with Boeing in developing a commercial tiltrotor, but Boeing went out in 1998 and Agusta came in for the Bell/Agusta BA609.
Leta 1981 z izkušnjami od XV-3 in XV-15 je Bell in Boeing Helicopters začel razvijati V-22 Osprey, dvomotorno turbogredno za Ameriške letalske sile in marince.