First the 737, The client did not like that the aircraft had only two engines.
Next the DC-8, empty weight was too light.20.09.19 - 14:09:01 Warn: [CFlightSimulatorInterfaceUsingFsuipc] Engine count missmatch db: 4 found 2
20.09.19 - 14:09:01 Debug: [CUserInterface] Could not start flight! Aircraft type does not match. (5)
Where it shows "db: 156610 Found 62057", those are weights in KG20.09.19 - 14:10:06 Warn: [CFlightSimulatorInterfaceUsingFsuipc] DOW missmatch db: 156610 Found 62057 ratio -0.603748
20.09.19 - 14:10:06 Debug: [CUserInterface] Could not start flight! Aircraft type does not match. (4)