Orbitz.com and ebookers.com, another Orbitz property, replaced Expedia as MSN.com's preferred travel agencies on MSN.com in the US and United Kingdom, reports Reuters.

MSN.com is the online home of parent company Microsoft, which reportedly made the switch because employees preferred Orbitz's features and customer service.

Orbitz said the change could draw 3.5 million additional visitors per month to its sites, giving it a traffic advantage over jilted rival Expedia.