Air France is set to sign a deal with groundworkers to approve a restructuring that aims to cut 2 billion euros ($2.5 billion) costs over the next few years, with flight attendant and pilot unions still holding out.

Unions including CFE-CGC, CFDT and FO said they would sign an accord with Air France on behalf of groundworkers who make up the large majority of the airline's 49,300 French employees.

The three unions make up more than 30 percent of the staff votes required for the accord to be approved.

Meanwhile, flight attendants' unions UNAC and SN-PNC said there were still obstacles to a deal, including the structure of shifts and hours. "If these obstacles are not overcome, then we are headed to a 'no' vote," said Didier Foussat of SN-PNC.

The company also said passenger traffic rose 4.6 percent in June across all regions, while cargo traffic fell 2.8 percent. (Reuters)