All major trade unions called for a national strike in Brussels that is scheduled to occur December 15th. Jet Airways has already begun to plan for the strike by canceling two flights and rerouting two more. Unions are protesting austerity measures implemented by the new government. This comes after a series of regional strikes over the past few weeks.
See "Trade Union Strike in Brussels: Jet Airways Cancels 2 Flights, Reroutes 2", The Economic Times, December 10, 2014