8
V. Liberatore
Pervasive Computing
Organization of air travel: a different view
lLayers: each layer implements a service
nvia its own internal-layer actions
nrelying on services provided by layer below
ticket (purchase)
baggage (check)
gates (load)
runway takeoff
airplane routing
ticket (complain)
baggage (claim)
gates (unload)
runway landing
airplane routing
airplane routing