Hi again Desertia
BASSA is indeed a branch of the T&GWU now better known as UNITE
I know that some posters on this forum will challenge that night follows day so from the opening page of the BASSA website:
•*BASSA•*About us
The British Airlines Stewards and Stewardesses Association (BASSA) is a branch of the Transport & General Worker's Union (T&GWU) exclusively for British Airways cabin crew. Our membership currently stands at 10524 which makes us the largest branch of the T&GWU.
That should clear that one up.