These are the numbers:
13,420 - the number of cabin crew employed
11,691 - the number of cabin crew balloted by Unite
7,482 - the number of cabin crew who voted to strike
4,923 - the number of cabin crew who went on strike (March through June)
667 - the number of cabin crew who went on strike but also worked
So 64% of Unite members voted to strike, and 42% of Unite members actually went on strike.
It is a minority, but it is still a sizable minority.