Avia Solutions Group, which leases aircraft and provides related services, has ordered 40 Boeing 737 Max 8 jets, with an option to order 40 additional jets, the companies said in a joint statement on Tuesday.

Boeing received its first order after reaching a deal with striking machinists, but it still faces a difficult road ahead.

Avia Solutions Group placed an order for as many as 80 Boeing Co. 737 Max jets as the aircraft charter operator prepares for growing demand for so-called wet leases during peak travel months.