VIENNA (Reuters) - Lufthansa's Austrian unit AUA has agreed a short-time work model and salary cuts of up to 15% with its on-board staff and 20% cost reductions with its suppliers and no longer sees itself immediately threatened by insolvency, it said.Negotiations between the government in Vienna and Austrian Airlines (AUA) and Lufthansa management regarding a 767 million euro (688 million pounds) request for state aid were ongoing and are expected to continue over the weekend, a spokesman said..