struct FlightDetail {
    string fltNum; //name of the flight
    uint256 depDte; //departure date (local time)
    uint256 expectedArrDte; //expected arrival date (local time)
    int256 actualArrDte; //actual Arrival Date given by Oracle
    uint8 fltStatus; //flight status (0=unknown, 1=on-time, 2=delayed, 3=cancelled, 4=other). Updated by Oracle or manually during tests
}