<p>You may be surprised, but many of the well known online travel websites belong to the same company.</p>
<h2>Priceline</h2>
<ul>
<li>Booking.com</li>
<li>priceline.com</li>
<li>agoda.com</li>
<li>KAYAK</li>
<li>Rentalcars.com</li>
<li>OpenTable</li>
<li>Rocketmiles</li>
</ul>
<h2>Expedia</h2>
<ul>
<li>Expedia</li>
<li>Hotels.com</li>
<li>Hotwire.com</li>
<li>trivago</li>
<li>Venere.com</li>
<li>Wotif.com</li>
<li>Travelocity</li>
<li>Orbitz</li>
<li>HomeAway</li>
</ul>
<h2>Ctrip</h2>
<ul>
<li>ctrip.com: Chinese site</li>
<li>trip.com: English site</li>
<li>Skyscanner: owned by Ctrip since November 2016( <a href="https://en.wikipedia.org/wiki/Skyscanner">https://en.wikipedia.org/wiki/Skyscanner</a>)</li>
</ul>
<h2>GDS (Global distribution system)</h2>
<p>Top 3 GDS:</p>
<ul>
<li>Sabre</li>
<li>Travelport</li>
<li>Amadeus</li>
</ul>
<p>OTAs depend on GDS to get data</p>


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