Sweden's Saab said on Friday that it submitted an improved offer for supply of new Gripen C/D fighter jets to Bulgaria, and is now proposing to deliver 10 jets instead of the initially proposed eight."The optimised offer meets all mandatory requirements set by Bulgaria, is within the limits of the set budget and the first jets will be delivered within 24 months after the contract has been signed," Saab said in a statement.The new offer will significantly improve the operating capabilities of the Bulgarian Air Force, Saab noted.In October, Saab offered to supply eight new Gripen C/D fighter jets equipped with the newest MS20 configuration to Bulgaria in response to the request for proposals received from the defence ministry in Sofia.The Gripen Material System 20 (MS20) capability enhancement for Gripen C-series involves both hardware and software upgrades, providing improvements and new functionality both in terms of the aircraft itself and the ancillary support and training systems, according to the manufacturer.