Mississauga, Ontario-headquartered film exhibitor Imax Corp. has announced it is extending its relationship with Chinese state-owned Omnijoi Cinemas, adding another 40 Imax locations through 2021. The new deal will more than double Omnijoi's number of Imax screens to 72. Omnijoi has become Imax's third largest partner in China and fifth largest in the world. The screens will be added to new multiplexes across Tier One to Tier Four cities in China, whose film market is expected to surpass the U.S. as the No. 1 film market by 2020.