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<p>businesses. Points can be redeemed for air travel, other goods or services, or for increased benefits, such as travel class upgrades, <a href="page.php?w=airport_lounge">airport lounge</a> access, fast-track access, or priority bookings.</p>

<p>Frequent-flyer programs can be seen as a certain type of <a href="page.php?w=virtual_currency">virtual currency</a>, one with unidirectional flow of money to purchase points, but no exchange back into money.</p>

<p>FFPs have become an important part of airlines' economic models, with for example United</p><p>
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