It was a busy fall morning at Reagan National Airport near Washington, D.C. Myrieme Churchill found a clearing in the arrivals hall and scanned the crowd.
One by one, her people showed up: a black father and daughter from Tennessee. A white couple from Georgia. A Somali immigrant. Two South Asians — one from Canada, one from Britain. Churchill greeted them in a blend of languages: Salaam! Bonjour! Welcome to D.C.! …