United asks pilots to take unpaid time off, citing Boeing's delayed aircraft CNBC
United asks pilots to take unpaid time off as Boeing issues persist Fox Business
Summer fliers brace for chaos from United, Boeing issues Business Insider

United flight to San Francisco diverted after odor fills cabin Fox Business
United Airlines flight diverted after toilet overflows into cabin The Hill
United Airlines flight to SFO diverted after toilet overflows San Francisco Chronicle

Windshield crack forces United Airlines 777 to land in Chicago UPI News
Travel Troubleshooter: United Airlines canceled my flight, so why can’t I get a refund? The Mercury News