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 AIRLINES (uid VARCHAR, Airline VARCHAR)
TABLE: CREATE TABLE FLIGHTS (FlightNo VARCHAR, Airline VARCHAR)

### Question ###
What are flight numbers of Airline "United Airlines"?

### Accurate SQL ###

SELECT T1.FlightNo FROM FLIGHTS AS T1 JOIN AIRLINES AS T2 ON T2.uid = T1.Airline WHERE T2.Airline = "United Airlines"