(Bloomberg) -- American Airlines Group Inc. flight delays swelled to more than 830 on Wednesday as the carrier sought to repair a technical issue affecting maintenance procedures.  American didn’t specify the problem that it said workers were “actively troubleshooting,” but individuals posted complaints on X.com about late flights in cities including Philadelphia, Miami, Chicago, Tampa, Florida and Austin, Texas. The issue delayed about 28% of American’s mainline flights, according to Flightaware.com, but ...