British Airways owner IAG has agreed to order 50 B737 MAX aircraft delivered between 2023 and 2027.

The order for 25 737-8-200 and 25 737 MAX 10 jets for short-haul operations at IAG-owned airlines is worth $6.25 billion. However, the company said it had negotiated a substantial discount, as is typical.

“The addition of new Boeing 737s is an important part of IAG’s short-haul fleet renewal,” IAG Chief Executive Luis Gallego said.

The order from such a large client is an essential signal to the market when Boeing faces an increasingly high-stakes battle to win certification of the largest MAX variant.