Boussa was born at Glain, near Liège on 13 January 1905. Pupil pilot with 67th promotion on 12 December 1931, he reached the rank of  Captain when War broke out in March 1940. He commanded 3/III/2 Sqn at Nivelles, equipped with Fairey Fox VI. He Escaped from ocupied Belgium and reached the UK on 1 June 1941. Being commissioned P/O and after a refresh course at the OTU of Heston starting on 27 July 1941 he was consecutively posted first to 131 Sqn on 30 August, than to 79 Sqn on 22 October, to 118 Sqn on 4 January 1942,to 615 Sqn on 7 January, to 234 Sqn on 18 February, 2 Delivery Flight on 22 February, 130 Sqn on 28 February, 124 Sqn on 4 March and finally to 350 (BE) Sqn on 28 March 1942 where he became flight commander. In December 1942 he took command over the Squadron. After being transferred to the SAS in early 1944, he was dropped in France, where he formed evacuation camps for escaped Allied air crew. He also executed intelligence missions. In August 1944, he organised a break through the enemy lines near Le Mans with 157 airmen. Posted to Staf duties, he led the recruting bureau for the Belgian Section of the RAF. Promoted W/Cdr, the Section was transferred to Belgium in November 1944. W/Cdr Boussa was awarded a DFC, a MC (28 November 1945) and the French Legion d'Honneur for his war activities. He died on 13 March 1967 at Clayes (France).