"FISO - Can give instructions on the ground but only information (including traffic information) in the air. .. .A/G - Can give information only with regard to the aerodrome operation, as opposed to specific traffic information (they're not trained nor qualified to do so).". .. .WRONG! INFORMATION is INFORMATION no matter what it concerns, its purpose is to permit a pilot to operate in accordance with the rules of the air. Whilst a FISO might be better qualified than some A/G ops, legally, there is no difference between A/G and AFIS when airborne. The Authority of the FISO ceases once you pass the holding point.