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</html><thumbnail_url>https://www.lifehacker.com.au/wp-content/uploads/2015/05/16/1253513498935343505.png?quality=75</thumbnail_url><thumbnail_width>640</thumbnail_width><thumbnail_height>358</thumbnail_height><description>Free flights and upgrades make travel rewards schemes awesome. The only problem? Some airlines aren&#x2019;t very flexible with them. They put limitations on when you can book reward travel, and that can be a huge let down. Here are the best and worst airlines for using travel rewards.</description></oembed>
