There are many opportunities to apply the utility-grade technology of passive optical networks to large transportation sites, municipal communications, commercial office parks, office towers, education campuses, and industrial sites. There are fewer potential failure points, and the greatly improved stability and security of very simplified non-hierarchical communications designs. 

https://www.tellabs.com/solutions/industries/transportation

Passive optical network use case presentation for airports and similar facilities:

https://www.youtube.com/watch?v=rnevVFzJx1M