This has now become a pattern. Google throws resources on some execs whims, kills off competitors and after a while exec cashes out, thanks to their rewards system. The left over bunch then figures out that the thing is not as profitable so they must either kill off their own product or let it stagnate into oblivion. Customers now are left with dead bodies and long recovery period before investor fears wears off and replacements arrives. This scorched earth approach has left too many areas without good products, growth and investments.

Google Flights is destined to be on chopping block sooner or later. It has not much influence on core business and is not going to be wildly profitable. The problem is that by the time Google kills it, Kayak and other competitors would be forced in to unrecoverable comma or just outright killed off as well.