National Union of Metalworkers of South Africa (Numsa) says it was consulting with workers on a secondary strike across the industry after talks with the South African Airways (SAA) ended without a deal.
"This secondary strike will have the impact of shutting down the entire aviation sector," National Union of Metalworkers of South Africa (NUMSA) spokeswoman Phakamile Hlubi-Majola told the media.
Consultations were underway with workers at organisations including the Civil Aviation Authority, Mango Airlines, SA Express, Airports Company South Africa and Comair, she said.
The national carrier is offering a 5.9 percent pay rise, while unions are demanding an eight percent across-the-board and a three year guarantee of job security.
SAA is one of the biggest airlines in Africa. It employs more than 5 000 workers, with a fleet of more than 50 aircrafts providing dozens of domestic, regional and international flights each day.
However, the carrier is deep in debt, despite several government bailouts and has not posted a profit since 2011.