Both planemakers are making a "final push," with the order set to include up to 70 wide-body jets including Airbus A350s and Boeing 787s and 777s, and up to 300 narrowbodies, they said.

Both planemakers declined comment. Tata Group did not immediately respond to a request for comment.

(Reporting by Tim Hepher, Aditi Shah; Editing by Jon Boyle)