The U.S. Air Force is buying two Boeing 747-8is from Lufthansa for training and spares as part of the delayed program to replace the current VC-25A “Air Force One” fleet, the service has confirmed to Aviation Week.

While still four years late, it’s an improvement on the last estimates for the troubled program, which has been plagued by workforce issues and cost overruns.

US Air Force and Navy fighter jets and military helicopters line up on the runway for an elephant walk on Kadena Air Base.U.S. Air Force photo by Senior Airman Tylir Meyer A 53-aircraft exercise put US military airpower on display in Japan earlier this week.

The new date—which is earlier than the “2028 or 2029” timeframe given earlier this year—emerged as an Air Force spokesperson confirmed to Defense One on Friday that the service would be giving Boeing an extra $15.5 million to upgrade the communications systems for the two VC-25Bs.

We almost had a midair collision up here,’ the JetBlue pilot said. ‘They don’t have their transponder turned on, it’s outrageous’

President Trump’s Air Force One delivery has slipped behind schedule again after the US Air Force admitted that the project would be delayed by another year.