The idea of agile is to launch early, then iterate new features once you've seen how the existing features are performing in production. Essentially, you'd nee

The idea of agile is to launch early, then iterate new features once you've seen how the existing features are performing in production. Essentially, you'd need to establish the MVP for an airport. An airport without a runway would be useless. How about an airport with baggage conveyor belts? OK, we could manually carry the bags until we've established what desks are busy, how many bags we're carrying, etc. How about shops? Well, maybe the cafés are more important, so lets build those first, and add duty-free shops later. But in other airports, the duty-free shops generate more profit, so maybe those should go first, and then you get a conflict of users needs vs organisational needs. Most big infrastructure projects are just that - big - because the cost of breaking them down into smaller projects and iterating would be massively more expensive.