BRUSSELS Belgium 's two largest airports have announced that they were cancelling all outbound flights scheduled on March 31, in a pre-emptive response to a nationwide strike expected to significantly disrupt air traffic control. Charleroi Airport, a major European hub for low-cost airline Ryanair south of Brussels , said all flights arriving or departing during the strike called by the country's two main unions would be cancelled. Brussels Airport, the country's largest, similarly said it