Shares plunged 8.88% after the New York bell to US$36.02 after the company posted third quarter earnings, which showed revenues were significantly below analysts' expectations.
The figure came in at US$439mln against US$451.8mln, which was the consensus figure expected.
EPS (earnings per share) was 36 US cents versus 35 US cents.
Meanwhile, another big loser, also in the travel space, was Priceline Group Inc (NASDAQ:PCLN), which saw shares plunge 9.43% after the bell to US$ 1,723.50.
The company reported disappointing fourth quarter guidance that overshadowed positive third quarter results.
Competitor Expedia's stock also dropped by over 2% in extended deals.
TrueCar Inc (NASDAQ:TRUE) also tanked after the bell. Shares lost over 28% to stand at US$ 11.70 a share.
The group posted third quarter results, which fell short of analysts' revenue estimates.
It came after the cloud computing group announced a new strategic partnership with search behemoth Google (NASDAQ:GOOGL), whose shares also nudged 0.13% higher after the bell.
The weight loss company also made a significant boost to its full year EPS guidance.