Friendly refueling with a smile.
Not a planefag but can tell you it means, a) this tanker is practicing refueling, b) it is actively refueling, or c) waiting to refuel and staying in position.
Not a planefag but can tell you it means, a) this tanker is practicing refueling, b) it is actively refueling, or c) waiting to refuel and staying in position.