Qatar and Saudi Arabia have been examining the advanced F-15 fighter-jet. Boeing has targeted Qatar and Saudi Arabia as key clients for the F-15. Executives said a contract between Boeing and a Gulf Cooperation Council state could be signed by 2011. "We're hoping for something to happen in the 2010-11 timeframe," Boeing Defense vice president Mark Kronenberg said. In a Feb. 3 briefing at the Singapore Air Show, Boeing outlined efforts to sell the F-15 and the F/A-18 fighter-jets to GCC states. Executives said Qatar and Saudi Arabia marked the biggest opportunities for their company over the next year. Kronenberg...