Boeing’s 737 Max has taken centre stage at the Dubai airshow as airlines announced plans to order up to 50 of the jets worth $6bn (£4.6bn) despite a global grounding in place since March.

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’s chief planning officer Alma Aliguzhinova told reporters, adding that budget carrier FlyArystan would start taking the jets in late 2021. The airline planned to hold 15 aircraft directly and may finance the rest through a lease transaction, she said.

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 planemaker’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.

In other business coinciding with the largest Middle East airshow on Tuesday, the Saudi budget airline Flynas agreed to buy long-range A321XLR jets; Airbus unveiled a provisional order for eight of its small A220 jets from Air Senegal; and Britain’s easyJet exercised options for 12 more Airbus A320neo aircraft.

Leasing company GECAS was expected to confirm an order for 25 Airbus planes, including 12 A330neo jets powered by engines from Rolls-Royce, a competitor to GECAS’s parent company General Electric.

However, there were no immediate signs that Dubai’s Emirates was ready to finalise a provisional order for 40 Boeing 787 Dreamliners, part of a complex set of interlocking deals driving fleet changes at the world’s largest international airline.

The fate of the order hinges on negotiations over the larger Boeing 777X, for which Emirates is the largest customer. Emirates has indicated it wants to restructure the order after delays and sources say it could use the pending 787 deal as leverage.