Hector Pascal
You are right about power in numbers.
However, pilots, airline staff will only get the "power" support if there are enough of them in TGWU for that union to provide the level of support (and information) you need.
TTGWU may look at the relatively few members and their contributions against the total cost of representing those members.
It is a difficult one to call but perhaps the advice to put into and lobby your specialised union is good advice.
Just a few thoughts on the matter.