In fact the world of Airlines tends to be large data and message communciations users.
Internationally voice communciations are used less than data. Historically data communciations tended to be more efficient and cost effective.
In today’s environment it is even more so, driven by customer internet activity and the improved accuracy of machine to machine data transfers.
Whether you are a regional low fare carrier or a full service long haul carrier, you need to be connected. The airline business model is one of data interconnectivity, not only between the airlines HQ and it’s own outstations but also with the bigger world of suppliers and even competitors.
Airlines tend to have a centralised HQ, usually based at thier primary hub airport and require commuciations to their outstations (secondary locations). Some smaller airlines only have very basic connectivity between HQ and outstations, others have more sophisticated private networks (VPNs). Others just rely on the internet as their primary data communications method.
Many larger airlines tend to have multiple hubs, which may act as regional HQ’s but essentially the airline industry works in a hub and spoke model, with telecommunications services following the same approach.
In the HQ, the airline is primarily concerned with LAN services. For communication to it’s outstations, it relys on WAN services, either private WAN or public internet, or a combination of both.