Brussels Airport and Charleroi Airport, the main airports serving Belgium's capital, have cancelled flights on Monday, March 31.

Brussels Airlines advised travelers that it has not yet canceled any flights, but is providing free rebooking options and refunds as a precautionary step to alleviate any potential travel congestion.

Passengers may want to brace themselves for major travel disruption as Brussels Airport and Charleroi ... potentially involving the 21 airlines flying from the UK to Belgium.