Sept 19 (Reuters) - China Development Bank Financial

Leasing, through its aircraft leasing unit, will

purchase fifty of Boeing's ( BA ) 737-8 aircraft, the company

said on Thursday.

The delivery of the purchased aircraft by China

Development Bank's unit, CDB Aviation Lease Finance, is expected

between 2028 and 2031.

The company said it is executing the deal in order to

"optimize the fleet structure and increase the proportion of

next-generation aircraft."

This marks the second major aircraft acquisition by the

Chinese firm recently, following their

announcement

last week of a purchase order for 80 Airbus

A320neo planes, with deliveries expected to begin in 2030.

No financial details of the purchase were disclosed.