Applying for a Licence To obtain an Air Traffic Controller Licence from CAAS, you will need to: be at least 21 years old; demonstrate the level of theoretical and practical knowledge as required by CAAS; and meet at least Class 3 medical requirements. For more detailed licensing requirements, please refer to: Manual of Standards - Licensing of Air Traffic Control Personnel Singapore Air Safety Publication (SASP) Part 9 The relevant application forms can be found here.