Final answer:
To model flight and airport relationships, a graph data structure or a database with foreign keys can be used to represent the nodes (airports) and edges (flights) with their corresponding connections.
Step-by-step explanation:
To model the relationships between flights and airports, you can use a graph data structure where airports are represented as nodes and flights as edges between those nodes. Each node (airport) can have multiple incoming and outgoing edges (flights), which correspond to the departures and arrivals of flights. The flights table would include foreign keys to the airports table, representing the start, destination, and any pass-over airports.