text: SELECT 
      THRESH,
      COUNTIF(dep_delay < THRESH AND arr_delay < 15) AS true_positives,
      COUNTIF(dep_delay < THRESH AND arr_delay >= 15) AS false_positives,
      COUNTIF(dep_delay >= THRESH AND arr_delay < 15) AS false_negatives,
      COUNTIF(dep_delay >= THRESH AND arr_delay >= 15) AS true_negatives,
      COUNT(*) AS total
  FROM dsongcp.flights, UNNEST([5, 10, 11, 12, 13, 15, 20]) AS THRESH
  WHERE arr_delay IS NOT NULL AND dep_delay IS NOT NULL
  GROUP BY THRESH
  