In 1996, Bell and Boeing had formed a partnership to develop a civil tiltrotor aircraft; however, in March 1998, it was announced that Boeing had pulled out of the project.
AgustaWestland AW609, v preteklosti Bell/Agusta BA609 je dvomotorni tiltrotor VTOL zrakoplov, podobne konfiguracije kot Bell Boeing V-22 Osprey.