A unusually large number of American air refueling aircraft are departing the United States for Europe. These aircraft are used to refuel fighter and bomber aircraft in the air so they do not have to land to get more fuel, therefore extending the range and duration of tactical aircraft.
The U.S. is participating in the 2025 Atlantic Trident exercise (June 16–27) via USAFE-AFAFRICA, deploying F-35As, F-15Es, and KC-135s likely to Finland. However, this number of refueling aircraft is abnormal.
This could be preparation for large scale air operations in the Middle East theater.