travelocity.comは安全ですか？

Their privacy policy seemed OK until the "Third party services" paragraph- and then is becomes a slaughterhouse. They use LSO Supercookies. As always social media integration means your privacy/security just got absolutely blown to hell. Don't do it! Logging in through a phone is even worse- and if you must it would be wise to disable geolocation.

In general, a very good site to purchase airline tickets, although flights from some airlines (like Southwest) are not available. However, if you do encounter a problem with a purchase be prepared for poor to fair customer service. In the last 15 years, I had two issues with purchased tickets and they basically ignored my requests. Ended up eating the losses. Now, I only use this site if they happen to have a lower airfare than the airline website.