WICHITA, Kan. - Three senior Boeing Co. employees have filed a lawsuit against the aircraft manufacturer claiming the company ignored numerous defective parts used to build airplanes. The three employees of Boeing's commercial aircraft division in Wichita brought the lawsuit in March on behalf of the U.S. government, alleging that Boeing was aware of nearly 2,000 defective parts from Ducommun Inc. of California used in 32 of the company's airplanes. The lawsuit became public Thursday after the U.S. Justice Department completed its investigation. A federal court filing said the parts ended up on $1.5 billion worth of planes delivered to...