Yesterday we flew Chicago to Frankfurt UA944 with shockingly light load. I didn't count it myself, but the flight attendant mentioned they only had 100 people checked in (a 777 with about 270 seats) so "feel free to stretch out".

Half of the E+ were people grabbing three seats each. Business had one empty seat only, not sure about First. I've taken one of the ORD-FRA or ORD-MUC trips about once a month, and they tend to be very full. Definitely a decent way to travel in coach even if it means not taking the most direct route. Is it the early afternoon departure, slow season, economy, or just an exception ...?