Kazakhstan flag carrier Air Astana said it had signed a letter of intent to order 30 Boeing 737 MAX 8 jets for its FlyArystan subsidiary.
Air Astana, which operates Airbus and Embraer jets in its main network, said it was confident in Boeing's ability to resolve problems with the MAX.
Global regulators banned commercial flights of Boeing's fastest-selling jet in March after two fatal accidents.
Plans for the jet's return to commercial service have been pushed back to early 2020 as Boeing finalises software and training revisions that need regulatory approval.
"We are making flying affordable for the people of Kazakhstan," Air Astana Chief Planning Officer Alma Aliguzhinova told reporters, adding that budget carrier FlyArystan would start taking the jets in late 2021.
The airline plans to hold 15 aircraft directly and may finance the rest through a lease transaction, she said, adding that Air Astana would not change the composition of its main fleet.
Separately, another airline signed a firm order for 10 Boeing 737 MAX 7 and 10 Boeing MAX 10 jets, a person familiar with the matter said. The airline's name was not disclosed.
Boeing has used the past two major industry events to try to secure market momentum for the grounded MAX, which is seen as key to the plane-maker's financial health over the coming decade.
A letter of intent between Boeing and British Airways owner IAG for 200 jets, which grabbed the spotlight at the Paris Airshow in June, has yet to be finalised as the European holding company discusses the fleet change with subsidiaries that currently use Airbus for medium-haul operations.
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