Banks support FTSE 100 even as airlines hit by Lufthansa warning

(Reuters) - London's main index inched up on Monday as rises in banking shares outweighed the impact of a profit alert from Germany's Lufthansa on airlines, while UK contractor Kier Group skidded to an all-time low.Both the FTSE 100 index and the FTSE 250 midcap index ended 0.2% higher. With the spotlight on Wednesday's U.S. Federal Reserve policy decision, the banking index broke a four-day losing streak with a 0.9% rise, led by Asia-exposed banks including HSBC and Prudential after Hong Kong's..