Google has optimized Google Flight Search for Android and iOS mobile devices -- before launching international capabilities.
Although Jeremy Wertheimer, Google's vice president, travel, said in November that international capabilities would be coming soon, Google Flight Search currently supports US destinations only. Google Flight Search debuted in beta in September.
And, some US airlines, such as Southwest and JetBlue, currently don't offer their fares through Google Flight Search. Southwest's absence is expected as it doesn't participate in third-party consumer sites; JetBlue's absence is somewhat of a surprise.
"Our distribution strategy has been focused on JetBlue.com, where customers can always find the lowest fares, though we haven’t ruled out any options at this time," says Allison Steinberg, a JetBlue spokesperson.
Like the desktop version, the Google Flight Search mobile website is very fast. And, it has similar capabilities, including map- and calendar-based searches for fares.
Google described the mobile rollout here.
Google Flight Search hadn't exactly extracted much pain on competitors through January, four months after its introduction. Experian Hitwise says Google Flight Search wielded about a 1% marketshare in the US metasearch category that month.