World Relations & Source Relations

World Relations:

flight(Airline,Flight_no,From,To)

Flight Information

Source Relations:

Schedule of pilots and aircrafts

schedule(Airline,Flight_no,Date,Pilot,Aircraft)

Flight database San Francisco International Airport

Flight database United Airlines

Pilot’s work schedule

sfo(Airline,Flight_no,To)

united(Flight_no,From,To)

ws(Date,From,To,Pilot,Aircraft)