The latest move comeas after talks between trade unions and SAA brooke down on Tuesday night.

JOHANNESBURG - Numsa has served South African Airways (SAA) with a secondary strike notice at Air Chefs.

Unions have vowed they would intensify the strike at the national carrier after talks broke down late on Tuesday night.

The strike is now in its sixth day.

Workers were demanding an 8% increase while SAA said it could only afford a 5.9% pay hike.

Striking SAA workers were continuing with their picket outside South African Airways Park in Kempton Park.

#SAAStrike [JUST IN] NUMSA has announced it has served SAA with a secondary strike notice at Air Chefs. TK — EWN Reporter (@ewnreporter) November 20, 2019

Numsa's Phakamile Hlubi-Majola said management made a 6.5% offer last night but backtracked at the last minute.

"During the course of that meeting an offer was made, an offer which we believed probably would have settled the strike."

She said that they were now planning to strike at Air Chefs.

"We have issued them with a strike notice for Air Chefs for a secondary strike."

Unions and management will meet again on Wednesday, hoping to find common ground and end the strike at SAA.