One Possible Answer
Surely you didn’t expect this in the notes :)
Flight: Flight Number, Origin, Destination, Departure Time,
Arrival Time, Available Seats, Company Name, Price
Passenger: Passenger Number, Name, Address, Phone Number
Booking: Flight Number, Passenger Number
Company: Company Name, Company Address, Company Phone
Passenger calls: Join: Flight, Company
Project: Departure Time, Company Phone
Restrict: Origin, Destination, Available Seatsɬ
Company calls: Join: Flight, Passenger, Booking
Project: Flight Number, Name, Phone Number