I think a few facts and figures might help this debate.
No of members in BASSA 10524 (BASSA Website yesterday)
No of members in CC89/Amicus (? - couldn't find any numbers of the Amicus website)
No of BA Cabin Crew 13500 (
http://bapress.custhelp.com , mid-Dec, I resume after the departure of those taking Voluntary Serverence)
Given those numbers BASSA represents 78% of Cabin Crew.
BA Press Release
"More than a third of the airline's total workforce are cabin crew: about 13,500 people. "
"There are about 11,500 crew based at Heathrow. Roughly 9,000 of these operate long haul flights and the remainder short haul. "
"At Gatwick there are about 1,300 crew who operate both long and short haul flights. "
"About 700 crew are employed overseas at bases such as Hong Kong and Singapore. More than 1,500 UK-employed cabin crew (about one in nine) have their main home abroad. More than 800 crew live in France or Spain. Some live in Australia, the USA or South Africa. "
So the Commuter percentage may not be as high as some have thought on this thread.
I work for BA, but not in Crew. My thoughts, not my employers.