Boeing’s long-troubled Air Force One replacement program has become even more expensive, adding to what has already been described as a costly and difficult project for the company. The latest update suggests the effort to build the next generation of presidential aircraft is slipping further behind schedule while losses keep mounting.

The company said it is making a major push to get the first of the two new presidential planes delivered, but that aircraft is now expected years later than originally planned. That delay is significant because the program was meant to provide updated planes for presidential travel, yet Boeing is still working through a demanding and expensive production process.

The project has increasingly weighed on Boeing because the rising costs appear to be outpacing earlier expectations. A bigger price tag means the Air Force One contract is continuing to pressure the company financially, turning a high-profile government program into a deeper burden.

The latest setback reinforces how challenging the Air Force One replacement effort has become. For Boeing, the issue is not only building two specialized aircraft, but doing so under intense scrutiny as delays and losses continue to define one of its most visible projects.