president obama nudging airlines to start refunding baggage fees if luggage is, quote, substantially delayed. no word yet on when flyers will see refunds, but there are ways to save time and money as you book those holiday flights. >> you've got all these apps and tools and resources you can use. >> reporter: for example, google flights and the hopper app, which claims it can tell you with 95% accuracy exactly when to book your flight. it says it can save the typical traveler $50, or even as much as $1,300. >> it will send you and tell you when the primetime to book them is. >> reporter: plus, there's freebird, a kind of insurance for your trip. for about $19, it will automatically rebook you, if your flight is missed or canceled due to delays. and david, one more tip for you, remember to look at two one-way fares, not just round trip. it used to be that round trip was the cheapest, that is not necessarily the case anymore. >> yeah, we used to avoid one way. all right, we're going to save some money. thanks, rebecca. >>> there's still much more ahead on "world news tonight" this wedn