听力原文： Thank you for calling Jet Stream Airlines. Please excuse this short delay. Due to our special low bargain fares, all our agents are busy assisting other callers. All calls will be answered in turn. Please stay on the line, and an airline representative will be with you shortly. Here's a tip for busy travelers. When planning your trip, don't forget to allow plenty of time to arrive at the airport. Improved airport security means longer lines when passing through security control. Domestic travelers should plan to arrive two hours before their scheduled departure time, while international travelers should arrive three hours ahead of time. Who is probably listening to this announcement?