New York (CNN Business)Boeing is set to deliver a 737 Max to United on Tuesday, the first delivery of the troubled plane since its grounding almost two years ago.The company has said it expects to deliver only half of those 450 planes by the end of 2021. While most of the remaining deliveries will be completed in 2022, some will not be cleared until the following year.Meanwhile, Boeing (BA) is scrambling to find new buyers for some of those planes. Cash-strapped airlines have canceled orders for an undisclosed number of the completed jets as they deal with the impact of the Covid-19 pandemic. Boeing has had limited luck finding new buyers, but last week discount Irish airline Ryanair (RYAAY) announced it would buy an additional 75 of the Max jets on top of its existing 135 orders.Read MoreBoeing kept building the planes despite not being able to deliver them to customers, in part to ensure its supplier base was not wiped out by the Max grounding. But that caused a huge cash drain for the company, as it usually receives most of the payment for a plane upon delivery. A 737 Max typically sells for about $55 million, according to industry experts.In United (BNO)'s case, to preserve cash the airline is planning to finance 100% of the cost of new aircraft for the foreseeable future and has arranged for $1.6 billion in financing to do so. United and the other airlines also have less of a need for new aircraft, as they have grounded many of their existing fleet due to drastically reduced schedules. Still, the 737 Max is more fuel-efficient than the older planes, so executives at several airlines have said they plan to park some earlier versions of 737s that were not grounded as they again start to use the 737 Max.United had 14 of the 737 Max in its fleet already before Tuesday's delivery and the company has said it expects to first fly the jet in the first three months of next year. Brazilian airline GOL said Monday that it will fly passengers on the 737 Max on Wednesday, which will make it the first airline to do so since the grounding. It said it will park older planes as it starts to use the seven 737 Max jets it already owns by the end of this year.In the United States American Airlines (AAL) plans to be the first airline to fly passengers on the Max starting Dec. 29 with flights between Miami and New York. Southwest (LUV), the only other US airline with the Max in its fleet, said it expects to start flying the Max sometime in the spring.Boeing announced Tuesday that it delivered only seven planes in November, bringing the year-to-date total to 118, about a third of the 345 it delivered in the same period last year. Only one plane it delivered in November was a passenger jet delivered to an aircraft leasing company. The others were freighters to cargo carriers such as UPS (UPS), FedEx (FDX) and DHL, or military versions of its commercial aircraft.Boeing also once again had more canceled orders than new orders in the month, though the 75 additional p