In the absence of any specifics by others who have been to the interview:
Technical:
Generic stuff; met, perf possibly specific to their airfields.
Specific; it's worth studying their a/c and your most recent type.
Company:
Current financials, a/c, fleet sizes, orders, routes.
HR:
Competency based under these titles:
Leadership and Management, Decision Making, Situational Awareness, Teamwork.
Think about your communication skills and how you make analytical decisions.
Good luck!