The flight 415 returned to service shortly after landing ; no injuries reported . Airline says return was ` ` precautionary , '' while passengers reported mechanical problems . Asked whether the plane went off the runway , a Delta spokeswoman said she could n't comment beyond the statement . Spanish newspaper El Pais says problem was related to hydraulic system .
The flight 415 returned to service shortly after landing ; no injuries reported . Airline says return was ` ` precautionary , '' while passengers reported mechanical problems . Spanish newspaper El Pais says problem was related to hydraulic system .