I doubt if ATSA's and other support staff would have gone in by crossing a picket line. I and my colleagues would not have.
It may be a sectional claim but its not a 'sectional' offer! Its a 4% payrise. THAT is why PCS and ATCE's are not best pleased. Will the ATCO's cross our picket lines? Hell yes they will in their droves (and Merc's!!)