Aircraft and weapons manufacturers, military officers, arms dealers and airline executives rubbed shoulders as the 2012 Singapore Airshow kicked off in a vast hangar near the city-state's Changi airport. Deals worth about $10 billion were announced at the last show in 2010 and the number could well be higher this year as Asian nations ramp up defence spending. Among the early deals announced on Tuesday was an order given to Raytheon Corp by Boeing Co for advanced radar systems on eight of its P-81 anti-submarine and anti-surface surveillance aircraft being sold to the Indian navy. India signed a $2.1 billion deal with Boeing for eight P-81 planes in 2009, according to media reports. The first of the aircraft is scheduled to be delivered to India this year. On the civilian side, Boeing signed its largest ever order for commercial aircraft, a $22.4 billion deal with Indonesia's Lion Air. The deal was originally announced in November. Boeing said Lion Air, Indonesia's largest carrier by passenger volume, has ordered 230 airplanes, including 201 737 MAXs and 29 next-generation 737-900 ERs. Lion Air will also acquire purchase rights for an additional 150 airplanes, Boeing said.