Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE FLIGHTS (Airline VARCHAR, SourceAirport VARCHAR)
TABLE: CREATE TABLE AIRLINES (uid VARCHAR, Airline VARCHAR)

### Question ###
How many 'United Airlines' flights depart from Airport 'AHD'?

### Accurate SQL ###

SELECT COUNT(*) FROM AIRLINES AS T1 JOIN FLIGHTS AS T2 ON T2.Airline = T1.uid WHERE T1.Airline = "United Airlines" AND T2.SourceAirport = "AHD"