– Put S back into the jet fuel. But, except for the Arctic, planes do not routinely fly that high. – Have tanker aircraft carry it to the stratosphere. But they can only get into the stratosphere in the Arctic. – Have fighter planes carry it to the stratosphere. But you would need many more planes. – Have tanker aircraft carry it to the upper troposphere and have fighter jets carry it the rest of the way. – Could you have a tanker tow a glider with a hose to loft the exit nozzle into the stratosphere?