The code changes in `pln.go` introduce a new `FlightSchedule` struct and validation logic. This struct represents a flight schedule and includes various fields such as date, category, flight number, aircraft registration, passenger configuration, ILS category, departure airport, departure time, schedule info, arrival time, arrival airport, comments, and reference. The `Validate` method ensures that the required fields are populated and returns an error if any field is missing. This addition improves the overall functionality and data integrity of the code.
windyboy
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