no reason whatsover why the aircraft could not have been quickly put back into service following a very minor tail scrape, if the engineers inspecting the damage were satisfied it was within SRM limits, the damage was most likely in a non pressurised area such as the apu accesss door /tail cone area, we recently had similiar happem on a A321, damage was found to the apu access doors which were repaired using HST and the aircraft was permited to fly under concession until a permanent repair was carried out