Flights to, from and over France have so far been spared the kind of disruption seen on French railways and the Paris public transport system.
Some unions representing Air France ground crew have joined the strike, as well as a limited number of air traffic controllers which saw the cancellation of around 20 percent of flights on specific protest days in early December before services largely returned to normal.
Pilots and flight crew have so far not been involved, but that could be about to change.
On Thursday several unions representing air crew, including the SNPL, called for members to walk out on Friday, January 3rd, possibly for an unlimited period.
Air crew unions had been having their own discussions with the government over the matter of retirement age – at present flight attendants can retire at the age of 55 and pilots at 60.
Under the government's proposed reforms, 'special regimes' which allow early retirement would be scrapped and everyone would have the same universal pension system with the legal retirement age of 62.
Certain exceptions for early retirement had been announced for physically demanding professions such as firefighters, police officers and members of the military – but not flight crew or pilots.
Following unsuccessful talks, unions have now given the government a deadline of December 23rd, otherwise they will commence strike action on January 3rd, possibly for an unlimited period.
Exactly how much disruption this would cause to flights depends on how many people follow the call to walk out, but the weekend was already set to be a busy one as it is the final weekend of the school holidays and many people had booked flights at the last minute following the announcement on Tuesday that there would be no 'Christmas truce' from rail workers, meaning that services on the railways will be severely limited over the holiday period.