What are the three types of lines pilots may have?

The correct choice identifies the three types of lines that pilots may have as Regular, Reserve, and Composite.

Regular lines refer to the standard flying schedules that cover predetermined flight duties with set routes and destinations. These are typically assigned to pilots based on their seniority and preferences while ensuring compliance with regulations regarding hours of service.

Reserve lines, on the other hand, are designated for pilots who may not have a fixed flying schedule but are available to fly when needed. This allows airlines to manage unexpected staffing needs due to coverage for absences, such as illness or other emergencies.

Composite lines combine elements of both regular and reserve lines, allowing flexibility in scheduling. They may include a combination of regular flying duties with some reserve availability, allowing pilots to have a more varied workload that can include regular duties while still being called upon to fill in as needed.

Understanding these line types is crucial for pilots to manage their schedules effectively and to comply with regulations regarding duty limits and rest periods.