Retrenched workers at the national carrier, Air Zimbabwe, have yet to receive their severance packages a year after being let go.
The airline, which operates a single aircraft, laid off 268 of its 500 employees.
Air Zimbabwe's debt of about US$300m is owed to foreign and local creditors.
The vice-president of the National Airways Workers Union, Elijah Chiripasi, said the packages were lower than expected.
An Air Zimbabwe insider said those retrenched were owed between ZWL$25,000 and ZWL$168,000 in benefits. The airline's assistant administrator, Tonderai Mukubvu, said all claims were being verified.
"Creditors can appeal should there be any variances. They can do so by providing documentary evidence," said Mukubvu.
He said once the evaluation was done, he would engage the government to make amendments.
Chiripasi said workers who had voiced grievances during a strike early this year had been victimised.
"Once employees voice concerns they are earmarked for retrenchment and we are also seeing a case of senior officials being placed on indefinite unpaid leave," he said.
A number of the airline's pilots and engineers are leaving, with some going to the Middle East. Late last year the airline lost two of its female pilots to Emirates and Fastjet.
"It has to do with poor remuneration and job insecurity. When you get another job offer, it's better to leave," said a former Air Zimbabwe employee.
Air Zimbabwe was suspended from the International Air Transport Association (Iata), making it difficult for the airline to fly to international destinations. The organisation said Zimbabwe owed it US$196m. Iata has since met President Emmerson Mnangagwa to discuss the issue.
Government VIPs, including Mnangagwa, use charter planes instead of the national airline.
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