CREATE TABLE "m2_f1_flights" (
  "vehicle_flight_num" text,
  "date" text,
  "pilot" text,
  "velocity_km_h" real,
  "altitude_m" real
);

Question: on august 16, 1963, what is the velocity?
SQL: SELECT SUM("velocity_km_h") FROM "m2_f1_flights" WHERE "date"='august 16, 1963';