Since you’ll hear about it in the news… It’s not fuel, it’s hydraulic fluid. The 777 has three hydraulic systems; losing one isn’t such a big deal. Now, why is Boeing & United specifically having such a hard time? They aren’t…you just don’t know this stuff isn’t that unusual & only certain stories get published. Did you hear about the United Airbus with a hydraulic failure? What about the United Airbus w/an engine oil warning? Surely you heard about the American Airbus that landed with a cargo door open! The Alaska 737 that had the same thing got a LOT of coverage… And who could have missed the Delta Airbus with a flight control malfunction! Oh…you didn’t hear about those? That’s weird – I wonder why they didn’t get coverage? I mean, they all happened in the last three days… It’s almost as if someone is choosing what you hear & what you don’t based on how worked up they can get you & how much advertising they can generate. Don’t let them. They will sensationalize stuff that people who work in this industry consider mundane – in part, because they don’t know better & because they are counting on you not knowing, either. (Thanks to @avherald for their coverage - the source of the pics. They report these incidents w/o bias & understand these things are not a sign the sky is falling)