Spirit AeroSystems Inc. in Wichita continues to diversify its portfolio, with one of the latest additions coming via its aftermarket services division. Spirit (NYSE: SPR) says in a press release that it it now has Federal Aviation Administration Repair Station Certification to do maintenance, repair and overhaul (MRO) work on thrust reverser assemblies — components that help slow the aircraft after landing — for the Airbus A319, A320, A321 and A330 models of passenger jets. The work, which…