Minor point I realise but CD's website lists BALPA as the second biggest pilot union in the World.
This may come as some surprise to the 13,600 pilots of American Airlines, who are represented by the Allied Pilots Association.
ALPA, the world's largest represents some 64,000 pilots.
APA only represents AA so maybe CD meant to say "The world's second largest non independant pilot union"?
It's all in the details.
Cheers,