Johannesburg - SAA technical staff will continue to strike until their wage demands are met, the SA Transport and Allied Workers' Union (Satawu) said on Wednesday.
"We, as the majority union, have not reached an agreement," spokesperson Vincent Masoga said.
"We are not happy with the wage offer and we will strike until we have won."
The airline announced that it had reached an agreement with the Aviation Union of Southern Africa (AUSA).
"SA Airways Technical (SAAT)... has concluded a wage deal with AUSA, which represents a large portion of engineers and technical staff at SAAT," SAA spokesperson Tlali Tlali said in a statement.
"The deal, signed earlier today, means SAAT and the airline will be able to continue with operations with minimal, if any, disruptions."
Tlali said the wage agreement would be for one year, with an increase of 6.5% of total cost to company.
Wage talks between SAA and Satawu resumed on Wednesday, but they could not reach a resolution. SAA said negotiations with Satawu would continue on Thursday afternoon.
Earlier the airline said it applied for an interdict to address "unruly, intimidating and unlawful behaviour by Satawu members during picketing".
"Contrary to assertions by Satawu, the interdict is not intended to stop the strike as this is a protected strike," Tlali said.
He said only two of 47 departures from OR Tambo International Airport had been delayed as a result of the strike.
The delays were of seven and 14 minutes, he said.