Low-cost carrier Ryanair will challenge the nine-billion euro rescue of Germany's Lufthansa, one of the world's biggest airlines, before an EU court, a top executive said on Thursday. "We have said to the commission we will appeal all other decisions and all approvals: the same goes for today's approval of aid to Lufthansa," Juliusz Gomorek, Ryanair's chief legal officer, told reporters. clp-arp/dc/bmm