In response to previous posting about assessment of damages.
The airline would claim on the ground handler not only for cost of repair but also any degradation in value to the aircraft, down time, loss of pax revenue, lease of replacement aircraft, all these known as consequential losses. As to who pays - it depends on the ground handlers insurance policy - I would imagine that the airline would have insisted that any company towing its aircraft has the full works - if not then it could become litigious. Furthermore, the Lessor / Legal owner would want to ensure that the proposed repair would not diminsh the aircraft value and would insist that the Lessee / Operator made good in the event that the ground handler or its insurer would not or could not.