Key Takeaways Starbucks rolls out Green Apron across U.S. stores to rebuild customer connection and lift transactions.SBUX says over 80% of U.S. stores hit 4-minute times, as Smart Queue fuels a return to positive sales comps.Starbucks' pilot stores outperform the system as Green Apron efforts aim to drive traffic-led profit recovery.Starbucks Corporation (SBUX) is betting big on its revamped Green Apron Service to restore customer connection and drive transaction growth after several soft quarters. The ini ...