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 AIRLINES (Airline VARCHAR, uid VARCHAR); CREATE TABLE FLIGHTS (Airline VARCHAR, SourceAirport VARCHAR)
  ### Question:
  Find all airlines that have flights from airport 'CVO' but not from 'APG'.
  ### Answer:
  SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid = T2.Airline WHERE T2.SourceAirport = "CVO" EXCEPT SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid = T2.Airline WHERE T2.SourceAirport = "APG"