Like the Tube strikes, Rail strikes etc. it will hit the punters more. They are the ones who keep "us" in jobs.
Perhaps a more appropriate action is something that makes a collective statement without causing too much strife directly.
Something like a "Go Slow day" where each crew adding a small delay to each flight (10-15 mins) by not "being ready". That way punters still fly, and at the end of the day the cumulative effect will be noticed.