SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid  =  T2.Airline WHERE T2.SourceAirport  =  "APG" INTERSECT SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid  =  T2.Airline WHERE T2.SourceAirport  =  "CVO"
Which airlines have departing flights from both APG and CVO airports?
SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid = T2.Airline WHERE T2.SourceAirport = `` APG '' INTERSECT SELECT T1.Airline FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T1.uid = T2.Airline WHERE T2.SourceAirport = `` CVO ''
select t1 . airline from airlines as t1 join flights as t2 on t1 . uid = t2 . airline where t2 . sourceairport = value intersect select t1 . airline from airlines as t1 join flights as t2 on t1 . uid = t2 . airline where t2 . sourceairport = value
Which airlines have departing flights from both APG and CVO airports ?