and restrictions on flight changes and refunds. plus -- >> if you are traveling as family, they don't guarantee you will sit together. >> i think that these basic economy fares are really good for an individual traveler. but for families, i don't think this is ideal. >> reporter: david, these new fares are for flights after march 1st. our experts recommend using apps like google flights and hopper to help you spot the best deals, david. >> thanks, rebecca. when we come back, the major headline about the seven newly discovered earth-sized planets, and what they reveal about the possibility of life. also ahead tonight, the deadly plane crash. emergency crews hiking through mud to reach the victims. januvia (sitagliptin) is a once-daily pill that, along with diet and exercise, helps lower blood sugar. januvia works when your blood sugar is high and works less when your blood sugar is low, because it works by enhancing your body's own ability to lower blood sugar. plus januvia, by itself, is not likely to cause weight gain