Dec 19 (Reuters) - Boeing ( BA ) said on Thursday

Turkey's low-cost carrier Pegasus Airlines had placed a firm

order for 100 737-10 MAX aircraft, with an option for 100 more.

The firm order is valued at $5.85 billion, according to

Reuters calculations based on data provided by consultancy

Cirium.

With Pegasus's order, the total orders for the largest model

in the 737 MAX family will be more than 1,200 jets, Boeing ( BA ) said

in a statement.