Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to know if airline miles are worth buying [title] Check how many points you need. [step] You might have some miles already saved but fall short of what you need to buy a ticket. For example, you might need 15 , 000 points to get a ticket.

Ending1: You have 10 , 000 points already, so you're 5 , 000 short. Should you buy the 5 , 000 points? [substeps] To find out, you'll want to identify how much your current miles saved will be worth. Ending2: Those points might increase or decrease over time until you lose some. In this event, you should already have at least 100 miles to spare. Ending3: Additionally, you might need miles and points for flights that trip nonstop or from one major destination to another. Check how many points you want to spend on commercial flights. Ending4: If 50 , 000 points are saved and you need to purchase a ticket, then you should have 70 , 000 points left. On the ticket itself, you might have enough points to cover 775 travel hours (or a week's maximum) but less than 20 , 000 points.

Answer format: ending1/ending2/ending3/ending4