The aircraft was developed from the experimental similar tilrotor XV-15, by Bell/Boeing in 1996, but Boeing pulled out in March 1998, and Agusta came in during September 1998. As of 2011, it is still being developed by Bell/Agusta Aerospace Company (BAAC), a joint venture between Bell Helicopter and AgustaWestland. Although the BA609 shares many features with the V-22 twice its size, they share practically no parts. The BA609 has a pressurized cabin, unlike the V-22.