CREATE TABLE table_63851 ("Airline" CLOB, "IATA" CLOB, "ICAO" CLOB, "Callsign" CLOB, "Commenced operations" FLOAT)

Which Commenced operations have an Airline of valuair?
SELECT MAX("Commenced operations") FROM table_63851 WHERE "Airline" = 'valuair'
SELECT MAX("Commenced operations") FROM "table_63851" WHERE "Airline" = 'valuair'