United Airlines reports 'most difficult' financial quarter in its 94-year history

United Airlines Holdings Inc.'s latest quarter was tough. How tough? The second quarter was the "most difficult financial quarter in its 94-year history," the airline said, reporting a quarterly loss of $1.6 billion and a year-over-year revenue drop of more than 87%. In the latest quarter, Chicago-based United (Nasdaq: UAL) saw a 93.4% drop in passengers, falling to 2.8 million passengers carried in April, May and June 2020 compared with 42.6 million the same period a year earlier. Total operating…