text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_13836704_7 (transit_passengers VARCHAR, airport VARCHAR)
  ### Question:
  How many different total number of transit passengers are there in London Luton?
  ### Answer:
  SELECT COUNT(transit_passengers) FROM table_13836704_7 WHERE airport = "London Luton"