During its recent investigation of Comair, the South African Civil Aviation Authority (SACAA) found a string of non-compliance with safety regulating standards.
Last Wednesday and Thursday, in particular, passengers saw flights delayed throughout the day.
The airline and union have been engaged in talks after the Labour Court reserved judgement on Thursday and stopped Numsa from striking.
The Labour Court is expected to rule on the matter on Tuesday.
The Labour Court will only hand down judgment on Comair’s bid to interdict Numsa's strike on Tuesday meaning the union will have to hold off until then.
Earlier this week, the airline applied for a court interdict after metal workers union National Union of Metalworkers of South Africa served a notice to strike.
The company decided to ground its flights on Monday after an Ethiopian Airlines passenger jet bound for Nairobi crashed minutes after take-off on Sunday killing all passengers on board.
The union has also called for improved wages travel allowances and what it believes are reasonable shift hours.
A working committee, made up of Numsa and Comair officials, was established last month in a bid to hash out an agreement.
Workers affiliated to Numsa announced their intention to strike last week. They are demanding a salary increase of 12% a 13th cheque and travel allowance.
Replacement staff have been brought in at airports to mitigate the effects of the stay away.
Workers affiliated to the United Association of South Africa have turned down the latest wage offer.
Workers affiliated to Uasa plan to strike at airports across the country.
Comair yesterday received a 48-hour strike notice from employees demanding higher wages.
The union, with 58 percent membership in the airport unit, wants a 35 percent increase over three years.
A BA aircraft experienced failure with a landing gear shortly after touching down from PE yesterday.
Earlier today the plane was involved in an 'incident' at the OR Tambo International Airport.
Comair earlier this week lost its court bid requesting that a decision to give SAA bailouts be scrapped.
