For airlines named Aeroflot Group, what is the alliance?
CREATE TABLE "by_scheduled_passengers_carried_millions" (
  "rank" real,
  "airline_holding" text,
  "passenger_fleet" real,
  "current_destinations" real,
  "alliance_association" text
);
SELECT "alliance_association" FROM "by_scheduled_passengers_carried_millions" WHERE "airline_holding"='aeroflot group';