Now three airlines began operating C-919 flights as delivery pace starting to pickup.

First flight of Air China's C-919 happened earlier.

First C-919 for Air China.

The first C-919 for Air China begin service.

Interior of C-919.

The first C-919 for China Southern took its first pre-delivery flight on Aug 3.

The 7th C-919 B-919H has been delivered to China Eastern on Jul 29. It's the third C-919 China Easten received this year.