Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to buy bulk airline tickets [title] Determine your destinations. [step] Before you can book bulk tickets, you need to know which cities you will be traveling between. This might be the same two cities on a regular basis if you travel for business, or it might be multiple cities at different times if you're booking a one-time trip for a large group.

Ending1: To book a plane ticket, you need to know exactly where you are going to it. [substeps] If you're traveling in many countries, you may want to get the cheapest ticket possible. Ending2: [substeps] For example, if you travel for business you might need 10 flights between boston and st. louis to cover your air travel for 3 months. Ending3: Determining your travel costs can help you write them down on the ticket. These expenses will include fuel costs, hotel expenses, fuel costs, rent and any necessary fees you incur in checking cargo when you purchase your tickets. Ending4: For instance, if you're going for a buyout trip, you may want to plan to book your bulk ticket at a state park. [title] Mark the drive-thru location on your ticket.

Answer format: ending1/ending2/ending3/ending4