The strike is the sixth job action of its kind in recent weeks, forcing the cancelation of half of the flights at Paris' Orly airport and about one-third of flights at Charles DE Gaulle airport.
Spain's top footballers have called off their strike and will be back in action on Saturday after resolving a pay dispute in marathon negotiations overnight.
Goldman Sachs, an investment bank, cancelled a conference in Las Vegas at the last minute and rebooked it in San Francisco, which cost more but sounded less fun.
All competitors are not allowed to oppugn or and have counterview with judges on site. Only written appeal for re-judgment is incepted after the competition.