SINGAPORE—Comac is aiming to adjust its C919 production rate upward by as much as 50% in 2025 as the Chinese OEM works toward reaching a rate of building 200 aircraft annually by 2029.

It also announced plans to increase annual C919 production capacity to 200 planes by 2029. Comac plans to produce over 50 C919 jets this year, up from its original target of 30, with annual output ...