He then served as a DFGA (Day Fighter/Ground Attack) Hunter pilot on 208 Sqn at RAF Muharraq in Bahrain.
He joined A (Fighter Test) Squadron of the Aeroplane and Armament Experimental Establishment at Boscombe Down.
He left the RAF and started work as a test pilot for Hawker Siddeley in 1973 and joined the Harrier project.
It had a larger composite wing and flap system giving greater range and payload than the previous Harrier.
On 19 May 1986 he was the first person to fly the single-seat British Aerospace Hawk 200 fighter plane on a flight of 1 hour 20 minutes from Dunsfold.
Snelling joined Air Europe in 1990 and flew Boeing 737 aircraft as a captain on European routes.