Lockheed Martin and the F-35 Joint Program Office have not disclosed the annual cost per tail for the jet in 2021.
In 2020, it will cost the Air Force approximately $7.8 million to fly one of its F-35As.
The Navy's F-35C aircraft carrier variant cost $9.9 million to fly in 2020, exceeding the $7.5 million target.
That year, the cost was $9.1 million, with one F-35C costing $7.9 million.
The company is already seeing results, according to the officials, and they expect the trend to continue in the coming years.
More than 90% of the F-35's parts are lasting longer than expected.
The JPO also anticipates that both metrics' costs will continue to fall until 2024, when they will begin to level off.