Fixing api errors which are noticed by testsoftware

[jobdk]

Testsoftware receives errors from some APIs. These errors have to be fixed.

• [ ] FlightControllerTest
• [ ] LocatorControllerTest
• [ ] NearestStationFinderControllerTest
• [ ] RegionalTrainRidesControllerTest
• [ ] RideShareControllerTest
• [ ] TrainRidesControllerTest