- string getFlightType () { return flightType;};
- string getAirline () { return airline; };
- string getAircraft () { return acType; };
- string getCallSign () { return flights.begin()->getCallSign (); };
- string getRegistration () { return registration;};
+ const string& getFlightType () { return flightType;};
+ const string& getAirline () { return airline; };
+ const string& getAircraft () { return acType; };
+ const string& getCallSign () { return flights.begin()->getCallSign (); };
+ const string& getRegistration () { return registration;};