Having an international flight that is delayed can pose many problems. It can interfere with connecting flights and other items on the itinerary. If there is a delay in the flight you will need to first contact the airline that is causing the delay. If there is a connecting flight with a different airline you will want to contact them as well to make arrangements for an alternate flight if necessary. If the delay will span over a great amount of time you will want to inquire about hotel and food vouchers during the delay. Under EU rules airlines have to provide hotels and food if delayed over a specified time and the fault lies with the airline.