How the heck did you find this?
https://mobile.united.com/FlightStatus/FlightDetails?carrierCode=UA&flightNumber=1657&flightDate=10/05/2015%2000:00:00&origin=SAN&destination=CLEhttp://www.flyertalk.com/forum/united-airlines-mileageplus/1714717-flag-stop-san-iad-red-eye-makes-flag-stop-cle.html
https://mobile.united.com/FlightStatus/FlightDetails?carrierCode=UA&flightNumber=2580&flightDate=11%2F12%2F2017%2000%3A00%3A00&origin=EWR&destination=NBW&GUID=01c88fb2-9f65-4e78-a62b-b184658ba0adhttps://flightaware.com/live/flight/UAL2580
https://mobile.united.com/FlightStatus/FlightDetails?carrierCode=UA&flightNumber=2245&flightDate=08/12/2015%2000:00:00&origin=ORD&destination=MDW
Let's find some random commercial flights instead of one-offs.There's IAH-ACC non-stop in a 747
https://flightaware.com/live/flight/UAE9252/history/20190625/0410Z/KORD/PHNLhttps://flightaware.com/live/flight/UAE9252/history/20190625/1455Z/PHNL/YSSY