Q: In this task, you will be given a passage to read. A fill in the blank question will be given to you.  Your answer should fit the blank appropriately.
Most aerodromes used for public transport operations are required to be licensed by the CAA . To be granted a licence an aerodrome operator must satisfy the CAA that : the physical conditions at the aerodrome , and its environs , are acceptable ; the scale of equipment , and facilities provided , are adequate for the flying activities which are expected to take place ; an effective safety management system is in place ; and that staff are competent and , where necessary , suitably qualified . Aerodromes classified as developed GA airfields or larger by the GASAR study are , with few exceptions , licensed . Only two basic GA airfields , Silverstone and Duxford , are licensed , and all airstrips are unlicensed . The Light Aviation Airports Study Group , a joint CAA @-@ industry initiative , was established in 2005 to review the regulation of light aviation aerodromes . A particular focus of this group was a review of the restrictions placed on unlicensed aerodromes . The group concluded that the requirement for public transport operations to be conducted only from licensed aerodromes should be further reviewed in the context of corresponding international and European requirements . It also recommended that restrictions on flight training at unlicensed aerodromes should be lifted , and this was permitted from April 2010 .fill in the blank  :Most aerodromes used for public transport operations are required to be licensed by the __________________ . 
A:
 CAA 