请用3-5句中文概括下面英语文段大意

请用3-5句中文概括下面英语文段大意
On a recent flight,Laura was chatting happily with Lisa,the woman in the next seat until the conversation turned to fares（票价）.The woman,who bought her ticket two months in advance,paid ＄109.Laura paid the full fare of＄457.She decided that next time she would find out how to spend less money.
Here are some ways to save money:
Cheap airplane tickets.To fly for less money,you can buy non-refundable plane tickets two or three months before your trip.The cheapest way to fly is as a courier（送快信的人）.In return for delivering a package for a courier company,you get a plane ticket that costs as little as one – quarter of the regular fare - - - or even less if the company needs someone at the last minute.Recently,a courier flew round trip from Los Angeles to Tokyo for＄100；a regular ticket cost around＄1,800 .
Train passes.If you are going to do a lot of traveling by train,a train pass will save you money.Buying a single pass gives you unlimited travel for a period of time.Train passes can be especially useful in India,which has the world’s largest rail system; in Japan,where trains are fast and convenient; and in Europe,where trains go to over 30,000 cities.
Hostels.Hostels used to provide cheap accommodations（住宿）for people under the age of 25.Nowadays,hostels don’t have any age requirements.They are not only cheap（＄8-＄17 a night） but a great way to meet people.Hostels are often in interesting places - - - a castle in Germany,a lighthouse in California,a one – room schoolhouse in the wilderness of Australia.And sometimes hostels have swimming pools.