What business does the airline have? What IT software systems are there?

First of all, as an enterprise, human resources are essential for airlines, which is nothing special;

Secondly, the operation network system required for aircraft operation is the core of airline operation, which is the key point;

Finally, other IT systems are systems that assist network operation, such as: pilot scheduling, flight attendant scheduling, maintenance and air material management system, personnel training system, marketing department ticketing system, etc.